Abstract: Software reliability test is an important way to assure the quality of the software. This paper presents XML test case module and a way to store test cases of software reliability test by using (Extensible Markup Language) XML technology. XML test case file creator and a test engine is implemented. The test case is read by the test driver program, which drives the tested program to run and compares the test result automatically. In this way, the software interface will be tested automatically and efficiently. Test data is divorced from test driver program for maintenance and reuse of the test data.