In this paper,according to the product traits of structure and the needs of management information systems, the code design principle of design management information system for constructing machine products is discussed, and the basic structures of kinds of codes are designed in detail.

This paper expounds how to develop character input test system by using VFP,focuses on the design of form, visual programming technique and code design technique of text box Interactive Change,and illustrates how to realize on-line presentation of the number of the characters correctly input,the speed of typing and the countdown of the clock.