Abstract: The resource allocation process and time sequence of resource requests in MAC protocol for multimedia satcom are analyzed systematically. Then, considering the long transmission delay between GEO satellite and earth, a resource request estimation algorithm based on traffic prediction is proposed to make up for the traffic deficiency in existing algorithms which are lagging far behind the increasing traffic. Introducing the recording operator into the algorithm to record the resource requests and relevant distribution so as to improve the bandwidth allocation efficiency, the algorithm can decrease the number of request signaling messages to shorten the response time for the request for network resource. LMS (least mean square) prediction is applied to predicting the network traffic so as to weaken the adverse effect of time delay due to long satellite link on request for network resources. The simulation results showed that the algorithm proposed is greatly superior to other existing resource request algorithms in the adaptability under conditions of high loadability and long peak transmission time.