diff --git a/app/Models/Contract.php b/app/Models/Contract.php
new file mode 100644
index 0000000..d51e2fe
--- /dev/null
+++ b/app/Models/Contract.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Contract extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/ContractEntity.php b/app/Models/ContractEntity.php
new file mode 100644
index 0000000..af1fcd3
--- /dev/null
+++ b/app/Models/ContractEntity.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ContractEntity extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/ContractLog.php b/app/Models/ContractLog.php
new file mode 100644
index 0000000..d8a0e95
--- /dev/null
+++ b/app/Models/ContractLog.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ContractLog extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/ContractObligation.php b/app/Models/ContractObligation.php
new file mode 100644
index 0000000..fc78c4d
--- /dev/null
+++ b/app/Models/ContractObligation.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ContractObligation extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/ContractObligationDependency.php b/app/Models/ContractObligationDependency.php
new file mode 100644
index 0000000..ddded59
--- /dev/null
+++ b/app/Models/ContractObligationDependency.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ContractObligationDependency extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/ContractObligationLog.php b/app/Models/ContractObligationLog.php
new file mode 100644
index 0000000..f114986
--- /dev/null
+++ b/app/Models/ContractObligationLog.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class ContractObligationLog extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/Entity.php b/app/Models/Entity.php
new file mode 100644
index 0000000..0551d0a
--- /dev/null
+++ b/app/Models/Entity.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class Entity extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/EntityLog.php b/app/Models/EntityLog.php
new file mode 100644
index 0000000..8bdb3e1
--- /dev/null
+++ b/app/Models/EntityLog.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class EntityLog extends Model
+{
+    use HasFactory;
+}
diff --git a/app/Models/EntitySignature.php b/app/Models/EntitySignature.php
new file mode 100644
index 0000000..00135da
--- /dev/null
+++ b/app/Models/EntitySignature.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class EntitySignature extends Model
+{
+    use HasFactory;
+}
diff --git a/database/migrations/2021_06_22_012552_create_entities_table.php b/database/migrations/2021_06_22_012552_create_entities_table.php
new file mode 100644
index 0000000..1f2b1a3
--- /dev/null
+++ b/database/migrations/2021_06_22_012552_create_entities_table.php
@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateEntitiesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('entities', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('user_id')->unsigned()->nullable();
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('entities');
+    }
+}
diff --git a/database/migrations/2021_06_22_012610_create_entity_signatures_table.php b/database/migrations/2021_06_22_012610_create_entity_signatures_table.php
new file mode 100644
index 0000000..b60d901
--- /dev/null
+++ b/database/migrations/2021_06_22_012610_create_entity_signatures_table.php
@@ -0,0 +1,35 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateEntitySignaturesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('entity_signatures', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('entity_id')->unsigned()->nullable();
+            $table->foreign('entity_id')->references('id')->on('entities')->onDelete('cascade');
+            $table->integer('type')->nullable()->default(1);
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('entity_signatures');
+    }
+}
diff --git a/database/migrations/2021_06_22_012626_create_entity_logs_table.php b/database/migrations/2021_06_22_012626_create_entity_logs_table.php
new file mode 100644
index 0000000..cb0c743
--- /dev/null
+++ b/database/migrations/2021_06_22_012626_create_entity_logs_table.php
@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateEntityLogsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('entity_logs', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('entity_id')->unsigned()->nullable();
+            $table->foreign('entity_id')->references('id')->on('entities')->onDelete('cascade');
+            $table->json('history')->nullable();
+            $table->text('remark')->nullable();
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('entity_logs');
+    }
+}
diff --git a/database/migrations/2021_06_22_012651_create_contracts_table.php b/database/migrations/2021_06_22_012651_create_contracts_table.php
new file mode 100644
index 0000000..ca5a1a3
--- /dev/null
+++ b/database/migrations/2021_06_22_012651_create_contracts_table.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateContractsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('contracts', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('user_id')->unsigned()->nullable();
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamp('completed_at')->nullable();
+            $table->timestamp('failed_at')->nullable();
+            $table->timestamp('start_at')->nullable();
+            $table->timestamp('end_at')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('contracts');
+    }
+}
diff --git a/database/migrations/2021_06_22_012652_create_contract_logs_table.php b/database/migrations/2021_06_22_012652_create_contract_logs_table.php
new file mode 100644
index 0000000..13890c9
--- /dev/null
+++ b/database/migrations/2021_06_22_012652_create_contract_logs_table.php
@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateContractLogsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('contract_logs', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('contract_id')->unsigned()->nullable();
+            $table->foreign('contract_id')->references('id')->on('contracts')->onDelete('cascade');
+            $table->json('history')->nullable();
+            $table->text('remark')->nullable();
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('contract_logs');
+    }
+}
diff --git a/database/migrations/2021_06_22_012704_create_contract_entities_table.php b/database/migrations/2021_06_22_012704_create_contract_entities_table.php
new file mode 100644
index 0000000..7f59fc4
--- /dev/null
+++ b/database/migrations/2021_06_22_012704_create_contract_entities_table.php
@@ -0,0 +1,41 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateContractEntitiesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('contract_entities', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('user_id')->unsigned()->nullable();
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->bigInteger('contract_id')->unsigned()->nullable();
+            $table->foreign('contract_id')->references('id')->on('contracts')->onDelete('cascade');
+            $table->bigInteger('entity_id')->unsigned()->nullable();
+            $table->foreign('entity_id')->references('id')->on('entities')->onDelete('cascade');
+            $table->bigInteger('entity_signature_id')->unsigned()->nullable();
+            $table->foreign('entity_signature_id')->references('id')->on('entity_signatures')->onDelete('cascade');
+            $table->integer('type')->nullable()->default(1);
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('contract_entities');
+    }
+}
diff --git a/database/migrations/2021_06_22_013528_create_contract_obligations_table.php b/database/migrations/2021_06_22_013528_create_contract_obligations_table.php
new file mode 100644
index 0000000..4860f7d
--- /dev/null
+++ b/database/migrations/2021_06_22_013528_create_contract_obligations_table.php
@@ -0,0 +1,49 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateContractObligationsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('contract_obligations', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('user_id')->unsigned()->nullable();
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->bigInteger('contract_id')->unsigned()->nullable();
+            $table->foreign('contract_id')->references('id')->on('contracts')->onDelete('cascade');
+            $table->bigInteger('contract_entity_id')->unsigned()->nullable();
+            $table->foreign('contract_entity_id')->references('id')->on('contract_entities')->onDelete('cascade');
+            $table->string('reference');
+            $table->json('content');
+            $table->integer('must_complete')->nullable()->default(1);
+            $table->integer('must_accept')->nullable()->default(1);
+            $table->integer('complete_status')->nullable()->default(1);
+            $table->integer('accept_status')->nullable()->default(1);
+            $table->integer('type')->nullable()->default(1);
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamp('completed_at')->nullable();
+            $table->timestamp('failed_at')->nullable();
+            $table->timestamp('start_at')->nullable();
+            $table->timestamp('end_at')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('contract_obligations');
+    }
+}
diff --git a/database/migrations/2021_06_22_013529_create_contract_obligation_logs_table.php b/database/migrations/2021_06_22_013529_create_contract_obligation_logs_table.php
new file mode 100644
index 0000000..2792b51
--- /dev/null
+++ b/database/migrations/2021_06_22_013529_create_contract_obligation_logs_table.php
@@ -0,0 +1,36 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateContractObligationLogsTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('contract_obligation_logs', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('contract_obligation_id')->unsigned()->nullable();
+            $table->foreign('contract_obligation_id')->references('id')->on('contract_obligations')->onDelete('cascade');
+            $table->json('history')->nullable();
+            $table->text('remark')->nullable();
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('contract_obligation_logs');
+    }
+}
diff --git a/database/migrations/2021_06_22_013621_create_contract_obligation_dependencies_table.php b/database/migrations/2021_06_22_013621_create_contract_obligation_dependencies_table.php
new file mode 100644
index 0000000..b35cc37
--- /dev/null
+++ b/database/migrations/2021_06_22_013621_create_contract_obligation_dependencies_table.php
@@ -0,0 +1,38 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateContractObligationDependenciesTable extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('contract_obligation_dependencies', function (Blueprint $table) {
+            $table->id();
+            $table->bigInteger('user_id')->unsigned()->nullable();
+            $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
+            $table->bigInteger('contract_obligation_id')->unsigned()->nullable();
+            $table->foreign('contract_obligation_id')->references('id')->on('contract_obligations')->onDelete('cascade');
+            $table->bigInteger('depend_contract_obligation_id')->unsigned()->nullable();
+            $table->foreign('depend_contract_obligation_id')->references('id')->on('contract_obligations')->onDelete('cascade');
+            $table->integer('status')->nullable()->default(1);
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('contract_obligation_dependencies');
+    }
+}