diff --git a/apps/qm/migrations/0049_alter_ptest_sample_number.py b/apps/qm/migrations/0049_alter_ptest_sample_number.py
new file mode 100644
index 00000000..b4ce9fe0
--- /dev/null
+++ b/apps/qm/migrations/0049_alter_ptest_sample_number.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2025-04-11 00:40
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('qm', '0048_auto_20250318_1342'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='ptest',
+            name='sample_number',
+            field=models.TextField(verbose_name='样品编号'),
+        ),
+    ]
diff --git a/apps/qm/models.py b/apps/qm/models.py
index 2cad5ec9..5abe5f40 100644
--- a/apps/qm/models.py
+++ b/apps/qm/models.py
@@ -412,7 +412,7 @@ class Ptest(CommonAModel):
         User, verbose_name='检验员', on_delete=models.CASCADE)
     testitem = models.ForeignKey(
         TestItem, verbose_name='测试项目', on_delete=models.CASCADE, null=True, blank=True)
-    sample_number = models.CharField('样品编号', max_length=20)
+    sample_number = models.TextField('样品编号')
     sample_count = models.PositiveIntegerField('样品数量', null=True, blank=True)
     sample_density = models.FloatField('样品密度', null=True, blank=True)
     specification = models.CharField(