diff --git a/src/crud/__init__.py b/src/crud/__init__.py
new file mode 100644
index 0000000..0f2a66d
--- /dev/null
+++ b/src/crud/__init__.py
@@ -0,0 +1,13 @@
+'''
+Desc:
+File: /__init__.py
+Project: crud
+File Created: Sunday, 28th August 2022 3:00:19 pm
+Author: luxuemin2108@gmail.com
+-----
+Copyright (c) 2022 Camel Lu
+'''
+import sys
+sys.path.append('./src')
+
+from models.manager import ManagerAssoc
diff --git a/src/crud/ddl.py b/src/crud/ddl.py
new file mode 100644
index 0000000..66a837a
--- /dev/null
+++ b/src/crud/ddl.py
@@ -0,0 +1,33 @@
+'''
+Desc:
+File: /ddl.py
+Project: crud
+File Created: Monday, 29th August 2022 10:23:08 pm
+Author: luxuemin2108@gmail.com
+-----
+Copyright (c) 2022 Camel Lu
+'''
+import sys
+sys.path.append('./src')
+from sqlalchemy import text
+from models.var import prefix, ORM_Base, engine
+
+
+def alter_foreign_quarter():
+    with engine.connect() as conn:
+        table = 'fund_morning_quarter'
+        source_table = 'quarter'
+        table_data = {
+            "table": table,
+            "target_key": 'quarter_index',
+            'source_table': source_table,
+            'foreign_name': table + '_fk_' + source_table,
+            'source_key': 'quarter_index'
+        }
+        sql = "ALTER TABLE {table} ADD CONSTRAINT {foreign_name} FOREIGN KEY ({target_key}) REFERENCES {source_table}({source_key})".format(**table_data)
+        conn.execute(text(sql))
+        conn.commit()
+
+if __name__ == '__main__':
+    alter_foreign_quarter()
+
diff --git a/src/models/quarter.py b/src/models/quarter.py
new file mode 100644
index 0000000..4a5a98a
--- /dev/null
+++ b/src/models/quarter.py
@@ -0,0 +1,53 @@
+'''
+Desc: 季度时间
+File: /quarter.py
+Project: models
+File Created: Sunday, 28th August 2022 9:21:25 pm
+Author: luxuemin2108@gmail.com
+-----
+Copyright (c) 2022 Camel Lu
+'''
+import sys
+sys.path.append('./src')
+from datetime import datetime
+from sqlalchemy import UniqueConstraint, CheckConstraint, MetaData, Table, Column, text, Integer, String, Date, DateTime, Enum, func
+from sqlalchemy.orm import validates
+from models.var import ORM_Base, engine
+
+class Quarter(ORM_Base):
+    __tablename__ = 'quarter'
+    id = Column(Integer, primary_key=True)
+    quarter_index = Column(String(12), nullable=False, unique=True)
+    start_time = Column(Date(), nullable=False, unique=True)
+    end_time = Column(Date(), nullable=False, unique=True)
+    updated_at = Column(DateTime,  server_default=text('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP'), onupdate=func.now()) 
+    created_at = Column(DateTime, server_default=text('CURRENT_TIMESTAMP'), comment='创建时间')
+    # created_at = Column(DateTime, server_default=func.now(), comment='创建时间')
+    UniqueConstraint(quarter_index, name='uix_1')
+
+    def __init__(self, *args, **kwargs) -> None:
+        super().__init__(*args, **kwargs)
+
+    @validates('end_time')
+    def validate_start_time(self, key, end_time):
+        # end_time_stamp = time.mktime(end_time)
+        end_time_stamp =  datetime.strptime (end_time, '%Y-%m-%d')
+        start_time_stamp = datetime.strptime (self.start_time, '%Y-%m-%d')
+        if end_time_stamp > start_time_stamp:
+            return end_time
+        else:
+            assert 'end_time cannot less than start_time' in end_time
+        return end_time
+
+    def __repr__(self):
+        return f"Quarter(id={self.id!r}, name={self.quarter_index!r})"
+
+def create():
+    ORM_Base.metadata.create_all(engine)
+
+def drop():
+    Quarter.__table__.drop(engine)
+
+if __name__ == '__main__':
+    # drop()
+    create()