The development of software has experienced several periods,and it comes nowadays, to the age of software engineering. Conceptionally, the software engineering consists of a number of system developement stages, and the major issue to be solved in the age of software engineering is technique and methodology to be applied to requirement definition and analysis. The key technique in requirement analysis will decide the quality of requirement definition and analysis. Requirement Specification Language/Requirement Specification Analyzor (RSL/RSA)is a comyter aided reuirement analyzor,which is structured upon specification as its kernel,based on the requirement specification data base.This paper,from the point of view of software engineering,proposes some key techniques in requirement analysis,introduces the concept of integrated software tool package,and advances designing objective for RSL/ESA.It also gives an explanation of functions,structure and applications for RSL/RSA as a computer aided requirenebt engineering tool,and makes a brief introduction on system development tendency,project planning and managemen,system design and other further work in the future.