Abstract: Using medium-to-large-scale distributed simulation system in joint training is an effective technical method to promote joint training ability and improve e±ciency. The paper starts with architecture of simulation system, analyses and compares existing typical architecture technologies, studies development of architecture technologies in simulation system. Taking marine joint training system as example, structured a kind of concept model of distributed simulation system that base on SOA, several key technologies are discussed. The paper have practical significance and reference values in building a new type of medium-to-large-scale distributed simulation system that based on joint training.