数据流分析在编译系统的代码优化、软件故障检测以及程序切片中都起着非常关键的作用。本文介绍了数据流分析方法的基本概念和基本原理，介绍了数据流方程的到达-定义迭代算法，并提出了一种利用VC++工具实现数据流方程求解的方法。-Data flow analysis in the build system, code optimization, software fault detection and program sections play a very crucial role. This article describes the data flow analysis and basic principles of the basic concepts, describes the arrival of the data flow equations- definition of iterative algorithm, and presents a tool using VC++ data flow equation method.