SLS Test Cases Generator is a system of generating test cases from system level requirement specifications. The analysis of test derivation is currently done manually because it is lack of automated analysis tools for test case generation. Applying various techniques and algorithms, this system researches possible approaches and methodologies of automation for this task. As a result, quality of test cases is improved, time and effort for serivation and review is reduced, thereby reducing the overall cost of system-level specification-based testing.