Description: This client is from Hertfordshirts in UK, the project is an application for the government. In fact it includes two parts: web site for data collection and presentation purpose, in parallel a windows application for administration purpose. Here the task is ensuring the quality of the web application, includes many aspects, such as function correctness performance acceptance, UI appropriateness and so on. Moreover, for testing function, we had to use the windows application to edit user൙s services and other data. The client only gave us the software requirement specification and the applications tested, there was not any test plan, test strategy, test cases, even test termination criterion. On the one hand, we had to spend much time in communicating with client to make clearly about some important points; on the other hand we had to get familiar with the application via operating it and reading requirements. Then, how to improve the efficiency of regression test?