During the software development, Software developers do not perform software-engineering task. In Software repository, source code is available and software developers use these repositories to support their activities. The research discipline of mining software repositories (MSR) uses these extant to understand the software system. So MSR brings together researchers and practitioners to consider methods of using data stored in software repositories to further understanding of software development practices. The main objective of this survey report is to define a research area in MSR and to discuss how MSR techniques are used.