diff --git a/apps/mtm/migrations/0003_mgroup_input_materials.py b/apps/mtm/migrations/0003_mgroup_input_materials.py
new file mode 100644
index 00000000..dc80de41
--- /dev/null
+++ b/apps/mtm/migrations/0003_mgroup_input_materials.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.2.12 on 2023-07-04 01:57
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('mtm', '0002_auto_20230626_1559'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='mgroup',
+            name='input_materials',
+            field=models.JSONField(blank=True, default=list, help_text='material的ID列表', verbose_name='直接材料'),
+        ),
+    ]
diff --git a/apps/mtm/models.py b/apps/mtm/models.py
index 1a832171..defc9c2d 100644
--- a/apps/mtm/models.py
+++ b/apps/mtm/models.py
@@ -53,6 +53,7 @@ class Mgroup(CommonBModel):
     name = models.CharField('名称', max_length=50)
     cate = models.CharField('分类', max_length=50, default='section', help_text='section/other')  # section是工段
     product = models.ForeignKey(Material, verbose_name='主要产品', on_delete=models.SET_NULL, null=True, blank=True)
+    input_materials = models.JSONField('直接材料', default=list, blank=True, help_text='material的ID列表')
 
     class Meta:
         verbose_name = '测点集'