Software implementation of new DVB test system is presented. The main task of the software is to test and diagnose DVB system. It also can analyze the video program source of DVB. Firstly, with the using of the multi thread scheduling algorithm in the structure, it can carry out simple real time analysis of DVB stream which is the key to realize on line system test. Then, it can be used to deal with the more complex and sophisticated off line DVB stream analysis. The analysis results of this software include information about SI tables, PCR, as well as errors detected in DVB stream.