本文应用“开－闭原则”、“依赖倒转”、“里氏代换”等编程模式和原则，构造了便于扩充数据库类型的系统架构，给出了通过配置参数转换数据库类型的方法。并对其可扩充性、易用性、代码复用进行了讨论。-In this paper,　open- closed principle　and　reverse dependency ,　Richter substitution　and other programming model and principles constructed to facilitate the expansion of the　type of system architecture, configuration parameters are given by converting　types. And its scalability, ease of use, code reuse is discussed.