diff --git a/backend/app/generator/model/gen_model.py b/backend/app/generator/model/gen_model.py
index 92fbc2b2..75f36bab 100644
--- a/backend/app/generator/model/gen_model.py
+++ b/backend/app/generator/model/gen_model.py
@@ -3,6 +3,7 @@
 from typing import Union
 
 from sqlalchemy import ForeignKey, String
+from sqlalchemy.dialects.mysql import LONGTEXT
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from backend.common.model import DataClassBase, id_key
@@ -18,7 +19,7 @@ class GenModel(DataClassBase):
     comment: Mapped[str | None] = mapped_column(String(255), default=None, comment='列描述')
     type: Mapped[str] = mapped_column(String(20), default='str', comment='SQLA 模型列类型')
     pd_type: Mapped[str] = mapped_column(String(20), default='str', comment='列类型对应的 pydantic 类型')
-    default: Mapped[str | None] = mapped_column(String(50), default=None, comment='列默认值')
+    default: Mapped[str | None] = mapped_column(LONGTEXT, default=None, comment='列默认值')
     sort: Mapped[int | None] = mapped_column(default=1, comment='列排序')
     length: Mapped[int] = mapped_column(default=0, comment='列长度')
     is_pk: Mapped[bool] = mapped_column(default=False, comment='是否主键')
diff --git a/backend/app/generator/service/gen_model_service.py b/backend/app/generator/service/gen_model_service.py
index eee4d3cc..f826fcea 100644
--- a/backend/app/generator/service/gen_model_service.py
+++ b/backend/app/generator/service/gen_model_service.py
@@ -25,7 +25,7 @@ class GenModelService:
                 if obj.name in [model.name for model in gen_models]:
                     raise errors.ForbiddenError(msg='禁止添加相同列到模型表')
             pd_type = sql_type_to_pydantic(obj.type)
-            await gen_model_dao.create(db, obj, {'pd_type': pd_type})
+            await gen_model_dao.create(db, obj, pd_type=pd_type)
 
     @staticmethod
     async def update(*, pk: int, obj: UpdateGenModelParam) -> int:
@@ -35,7 +35,7 @@ class GenModelService:
                 if obj.name in [model.name for model in gen_models]:
                     raise errors.ForbiddenError(msg='禁止添加相同列到模型表')
             pd_type = sql_type_to_pydantic(obj.type)
-            count = await gen_model_dao.update(db, pk, obj, {'pd_type': pd_type})
+            count = await gen_model_dao.update(db, pk, obj, pd_type=pd_type)
             return count
 
     @staticmethod
diff --git a/backend/templates/py/model.jinja b/backend/templates/py/model.jinja
index 9eabe680..4d6d8801 100644
--- a/backend/templates/py/model.jinja
+++ b/backend/templates/py/model.jinja
@@ -27,7 +27,7 @@ class {{ table_name_class }}({% if have_datetime_column %}Base{% else %}MappedBa
         None
     {%- else -%}
         {%- if model.default != None -%}
-            {{ model.default }}
+            '{{ model.default }}'
         {%- else -%}
             {%- if model.pd_type == 'str' -%}
                 ''
@@ -49,5 +49,5 @@ class {{ table_name_class }}({% if have_datetime_column %}Base{% else %}MappedBa
                 ''
             {%- endif -%}
         {%- endif -%}
-    {%- endif -%}, sort_order={{ model.sort }}, comment='{{ model.comment }}')
+    {%- endif -%}{% if model.sort != 0 %}, sort_order={{ model.sort }}{% endif %}, comment='{{ model.comment }}')
     {% endfor %}