Abstract: Aiming at the develop requirement of the radar EW(electronic warfare) simulation under the complex electromagnetic environment, the method of radar EW composable simulation was brought up. This paper expounds the basic theory of composable simulation, analyzes the development model of component-based composable simulation, and studies the implementation technology from four aspects of simulation—component development, testing, management and assembly. The supporting tools for component-based simulation of radar EW were designed and realized, which could be used to reduce the difficulty of composable simulation development and improve the automation degree of composable simulation.