Firstly, the importance of database in software system development is analyzed, the gap between domestic data and foreign large databases is pointed out, and SQL Server 2000 and domestic databases are mainly compared and analyzed from several aspects such as data types, variable declarations and assignments, stored procedure definitions, executions and some SQL statements, with SQL Server 2000 and domestic databases - Kingbase ES3.1. Openbase et al. propose solutions to the problem of data portability between them.