A PTS Based synchroniztion display technology of video stream is presented to solve asynchronous display problem of node computer in cluster. Features of cluster tiled display system is analysed. Video stream synchronous mechanism based on PTS information is researched, and the implementation of modules, such as multicast receiving, stream unpacking, video decoding, synchronization control, are discussed. The experimental results show that PTS based synchronization display technology of video stream in cluster is effective.