Abstract: The development of MTS——Micro-software Testing System is useful for controlling the quality of software better with less cost.The static analysis can identify the errors in lex,syntax and data-flow of the program,whereas the dynamic analysis,by use of instrumentation,can make the evaluation of the running time behaviors of the program,and help the programmer to do the test coverage analysis.The basic structure of lexical analyzer,syntax analyzer,instrumentor and cross-reference program is also described in the paper.Finally,the appraisal of the system is presented.