尝试备份和还原数据库，而不是附加MDF文件.
此外，除非您运行以下命令，否则SQL Server MDF文件可能不向后兼容:

Try backing up and restoring the database instead of attaching the MDF file.

Also SQL server MDF files might not be backward compatible unless you have run the following :

----SQL Server 2005 database compatible level to SQL Server 2000
EXEC sp_dbcmptlevel dbname, 80;
GO
----SQL Server 2000 database compatible level to SQL Server 2005
EXEC sp_dbcmptlevel dbname, 90;
GO