Abstract: The Software testing phase of the development life cycle model of software plays a very important role in deciding the quality and functionality of the software. The Testing of the software is done to detect the fault in its functionality and on the basis of its performance further quality of software is improved. In the software testing phase there is a task involved which is prioritization of Test cases. In this paper we have discussed about test case prioritization, what is the need of test cases prioritization? And the various techniques proposed by researchers for performing the test case prioritization.