diff --git a/hb_server/apps/mtm/migrations/0041_alter_material_type.py b/hb_server/apps/mtm/migrations/0041_alter_material_type.py
new file mode 100644
index 0000000..54bada2
--- /dev/null
+++ b/hb_server/apps/mtm/migrations/0041_alter_material_type.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.9 on 2021-12-03 01:09
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mtm', '0040_material_piece_count'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='material',
+            name='type',
+            field=models.PositiveSmallIntegerField(choices=[(1, '成品'), (2, '半成品'), (3, '主要原料'), (4, '辅助材料'), (5, '加工工具'), (6, '辅助工装')], default=1, verbose_name='物料类型'),
+        ),
+    ]
diff --git a/hb_server/apps/mtm/models.py b/hb_server/apps/mtm/models.py
index a131e3d..5d39027 100644
--- a/hb_server/apps/mtm/models.py
+++ b/hb_server/apps/mtm/models.py
@@ -36,7 +36,7 @@ class Material(CommonAModel):
     name = models.CharField('物料名称', max_length=100)
     number = models.CharField('编号', max_length=100, unique=True)
     specification = models.CharField('型号', max_length=100, null=True, blank=True)
-    type = models.CharField('物料类型', choices= type_choices, max_length=20, default=1)
+    type = models.PositiveSmallIntegerField('物料类型', choices= type_choices, default=1)
     sort_str = models.CharField('排序字符', max_length=100, null=True, blank=True)
     unit = models.CharField('基准计量单位', choices=unit_choices, default='块', max_length=10)
     count = models.IntegerField('物料总数', default=0)