In order to solve the problem of multiplex equips and complicated jam manners in electronic countermeasure simulation, an asynchronous cooperative edition technology of scenario is presented on this paper. A concentrative system structure is adopted, and scenario data of different majors is completed by different cooperative editing groups according to certain format as XML of electronic countermeasure simulation’s scenario, which is finally parsed and merged, and scenario finished. The result of analyzing shows that, this method well and truly meets the requirements of cooperative editing of electronic countermeasure simulation.