Sparse code multiple access(SCMA) is a novel non-orthogonal multiple ashley furniture porter b697-92 (porter 3-drawer nightstand) access scheme to face the future 5G communication.In allusion to the problem that sparse code multiple access(SCMA) system based on a logarithm-domain MAX-Log message passing algorithm(MPA) for multiuser detection has lower detection performance, this paper adopts a method that the message updating formula of the resource node is multiplied by a factor, which can reduce the lost messages of the original MAX-Log MPA algorithm for approximate computing the updating message of resource node.The theory and simulation results show that the improved MAX-Log MPA multiuser detection algorithm can not only maintain the low complexity of the original fairytale once upon a time theme party MAX-Log MPA algorithm, but also obtains better detection performance.