Currently, the influx of streaming media business tends to aggravate network congestion. In order to improve network efficiency, a new TCP-like congestion control algorithm based on RTP/TRCP protocol model is proposed in this paper. This algorithm uses an improved AIMD mechanism to control window for adjusting the transmission rate of RTP data frame by adopting TCP acknowledgment mechanism and RTCP report. This algorithm firstly deduces the formula of average delay jitter and defines some parameters such as round trip time and timeout clock value. Secondly, a kind of transmission control strategy based on feedback is presented. More importantly, this algorithm completely abandon the retransmission mechanism of TCP to keep continuity and real-time of streaming media business. The experimental results show that, compared with other RTP flow control algorithm, the proposed algorithm has better congestion control ability and it can restrain the jitter effectively