Aimed at the problems that Mesh network services are various and calculation ability is insufficient in Spacebased backbone Mesh network congestion control is not sufficient, acknowledgement is unreliable and the requirement of QoS guarantee in the SOAR algorithm are different service, this paper proposes a new opportunistic routing algorithm with reliable joint acknowledge and supporting multiservice. The algorithm defined expected successful transmission count to describe the integral state of links and effectively took the load balancing and link congestion control into consideration. The new algorithm designed an adaptive route selection to achieve the selfadaptation control between route selection and diversified services. The simulation results show that the algorithm in the paper has better preference in adaptively selecting the best transmission path according to the difference of service. What’s more, the performance of the algorithm is better in the transmission delay, the throughput and the throughput rate than the SOAR routing algorithm