diff --git a/business/migrations/0008_alter_case_paymentcollection.py b/business/migrations/0008_alter_case_paymentcollection.py
new file mode 100644
index 0000000..75609fc
--- /dev/null
+++ b/business/migrations/0008_alter_case_paymentcollection.py
@@ -0,0 +1,16 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("business", "0007_add_case_change_request_model"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="case",
+            name="paymentcollection",
+            field=models.CharField(blank=True, default="", max_length=100, verbose_name="已收款"),
+        ),
+    ]
diff --git a/business/migrations/0009_alter_case_paymentcollection_and_more.py b/business/migrations/0009_alter_case_paymentcollection_and_more.py
new file mode 100644
index 0000000..fa4a09f
--- /dev/null
+++ b/business/migrations/0009_alter_case_paymentcollection_and_more.py
@@ -0,0 +1,56 @@
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("business", "0008_alter_case_paymentcollection"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="case",
+            name="paymentcollection",
+            field=models.CharField(blank=True, default="", max_length=100),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="applicant",
+            field=models.CharField(max_length=100),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="approvers_order",
+            field=models.TextField(blank=True, null=True),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="change_agreement",
+            field=models.TextField(),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="change_item",
+            field=models.TextField(),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="change_reason",
+            field=models.TextField(),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="is_deleted",
+            field=models.BooleanField(default=False),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="state",
+            field=models.CharField(default="审核中", max_length=100),
+        ),
+        migrations.AlterField(
+            model_name="casechangerequest",
+            name="times",
+            field=models.CharField(max_length=100),
+        ),
+    ]
diff --git a/business/models.py b/business/models.py
index 1066a79..6cfa9d9 100644
--- a/business/models.py
+++ b/business/models.py
@@ -58,7 +58,7 @@ class Case(models.Model):
     ChangeReason = models.TextField(null=True, blank=True)  # 变更原因
     ChangeAgreement = models.TextField(null=True, blank=True)  # 变更协议（URL列表）
     invoice_status = models.CharField(max_length=100, default='未开票')  # 已开票
-    paymentcollection = models.CharField(max_length=100) # 已收款
+    paymentcollection = models.CharField(max_length=100, default='', blank=True) # 已收款
     state = models.CharField(max_length=100)  # 状态
     approvers_order = models.TextField(null=True, blank=True)  # 审核人顺序（JSON格式存储，如：["张三","李四","王五"]）
     is_deleted = models.BooleanField(default=False) # 软删除标记
diff --git a/business/views.py b/business/views.py
index 5011eb8..b0e6eb0 100644
--- a/business/views.py
+++ b/business/views.py
@@ -1062,7 +1062,7 @@ class caseManagement(APIView):
                         Closingapplication=json.dumps(closing_application_list, ensure_ascii=False),
                         ChangeRequest="",
                         invoice_status=invoice_status or '未开票',
-                        paymentcollection=paymentcollection,
+                        paymentcollection=paymentcollection or "",
                         state="审核中"
                     )