This paper present a retrieval model based on natural language according to pattern database system features. This paper also spell out a series of issues about how to convert natural language into SQL sentence.

• 根据图案数据库的特点 ,提出了一个基于自然语言的检索模型 ,论述了怎样将自然语言转换成查询语句 (sql语句 )需要注意的一系列问题