diff --git a/application/opa_mgnt/forms.py b/application/opa_mgnt/forms.py
index 1ce6ab7..64eff58 100644
--- a/application/opa_mgnt/forms.py
+++ b/application/opa_mgnt/forms.py
@@ -1,21 +1,10 @@
 from django import forms
+
+from common.forms import DepartmentSelectionForm
 from .models import *
-from ..org_mgnt.models import PrimaryDepartment, SecondaryDepartment
 
 
-class SocialMediaAccountRegistrationForm(forms.ModelForm):
-    primary_department = forms.ModelChoiceField(
-        queryset=PrimaryDepartment.objects.all(),
-        widget=forms.Select(attrs={'class': 'form-control'}),
-        empty_label="选择一级部门",
-        label="一级部门"
-    )
-    secondary_department = forms.ModelChoiceField(
-        queryset=SecondaryDepartment.objects.none(),
-        widget=forms.Select(attrs={'class': 'form-control'}),
-        empty_label="选择二级部门",
-        label="二级部门"
-    )
+class SocialMediaAccountRegistrationForm(DepartmentSelectionForm, forms.ModelForm):
 
     class Meta:
         model = SocialMediaAccountRegistration
@@ -30,14 +19,6 @@ class SocialMediaAccountRegistrationForm(forms.ModelForm):
 
     def __init__(self, *args, **kwargs):
         super(SocialMediaAccountRegistrationForm, self).__init__(*args, **kwargs)
-        if 'primary_department' in self.data:
-            try:
-                primary_department_id = int(self.data.get('primary_department'))
-                self.fields['secondary_department'].queryset = SecondaryDepartment.objects.filter(primary_department_id=primary_department_id).order_by('secondary_department_name')
-            except (ValueError, TypeError):
-                pass
-        elif self.instance.pk:
-            self.fields['secondary_department'].queryset = self.instance.primary_department.secondarydepartment_set.order_by('secondary_department_name')
 
 
 class AccountOperationManagementForm(forms.ModelForm):
diff --git a/common/forms.py b/common/forms.py
new file mode 100644
index 0000000..2cce0e0
--- /dev/null
+++ b/common/forms.py
@@ -0,0 +1,31 @@
+from django import forms
+
+from application.org_mgnt.models import PrimaryDepartment, SecondaryDepartment
+
+
+class DepartmentSelectionForm(forms.Form):
+    primary_department = forms.ModelChoiceField(
+        queryset=PrimaryDepartment.objects.all(),
+        widget=forms.Select(attrs={'class': 'form-control'}),
+        empty_label="选择一级部门",
+        label="一级部门"
+    )
+    secondary_department = forms.ModelChoiceField(
+        queryset=SecondaryDepartment.objects.none(),
+        widget=forms.Select(attrs={'class': 'form-control'}),
+        empty_label="选择二级部门",
+        label="二级部门"
+    )
+
+    def __init__(self, *args, **kwargs):
+        super(DepartmentSelectionForm, self).__init__(*args, **kwargs)
+        if 'primary_department' in self.data:
+            try:
+                primary_department_id = int(self.data.get('primary_department'))
+                self.fields['secondary_department'].queryset = SecondaryDepartment.objects.filter(primary_department_id=primary_department_id).order_by('secondary_department_name')
+            except (ValueError, TypeError):
+                pass
+        elif 'instance' in kwargs and kwargs['instance']:
+            instance = kwargs['instance']
+            if hasattr(instance, 'primary_department'):
+                self.fields['secondary_department'].queryset = instance.primary_department.secondarydepartment_set.order_by('secondary_department_name')