This paper designs and implements a living video system based on DSS. Firstly, the software core architecture of DSS server is analyzed. In view of the network congestion and packet loss caused by UDP transmission in living video system, the congestion control scheme based on RTCP feedback is adopted, After the system test shows that the average delay when living is about 100 ms, and the overall test picture is smooth, effectively reduce the network congestion and packet loss; and CPU occupancy rate test shows that with the increase in user CPU occupancy rate is not presented obviously increase, singleuser CPU occupancy rate stabilized between 1% to 3%, 20 users CPU occupancy rate stabilized between 6% to 9%, indicating that the system concurrent processing performance is better. The overall system has a good performance, to meet the practical application needs.