diff --git a/server/apps/supervision/migrations/0070_alter_pt_certificate_date.py b/server/apps/supervision/migrations/0070_alter_pt_certificate_date.py
new file mode 100644
index 0000000..40f5891
--- /dev/null
+++ b/server/apps/supervision/migrations/0070_alter_pt_certificate_date.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2024-05-08 07:13
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('supervision', '0069_alter_pt_result'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='pt',
+            name='certificate_date',
+            field=models.DateField(blank=True, null=True, verbose_name='证书日期'),
+        ),
+    ]
diff --git a/server/apps/supervision/models.py b/server/apps/supervision/models.py
index 19e10c8..40b09e4 100644
--- a/server/apps/supervision/models.py
+++ b/server/apps/supervision/models.py
@@ -256,7 +256,7 @@ class Pt(CommonBDModel):
     params = models.TextField('参加参数名称')
     result = models.PositiveSmallIntegerField('结果', choices=pt_result_choices, default=0, help_text=str(pt_result_choices))
     handle_result = models.PositiveSmallIntegerField('处理结果', choices = pt_hresult_choices, default=0, help_text=str(pt_hresult_choices))
-    certificate_date = models.DateField('证书日期', null=True, blank=True, default='')
+    certificate_date = models.DateField('证书日期', null=True, blank=True)
     field = models.PositiveSmallIntegerField('领域', choices=field_choices, help_text=str(field_choices),default=0)
     a_class = models.BooleanField('A类', default=True)
     task2do = models.ForeignKey('supervision.task2do', verbose_name= '关联任务执行', on_delete=models.SET_NULL, null=True, blank=True)