Abstract: As an important technology of programming analysis, data flow analysis is widely applied into kinds of software projects. Problem of variables being hidden and covered for their scope has not been taken into accout in traditional dataflow iteration analysis,leading to inaccurate data flow information. An improved dataflow analysis method based on variables scope and traditional dataflow iteration analysis method was proposed to solve the problem of varibles being hidden and covered. At last, both of these methods were applied into program slice, which proves the efficiency of the improved one by comparing.

Key words: Data flow, Iteration, Socpe, Program slicing