Abstract: A virtual verification method of maintainability for the radar system based on DELMIA is researched in this paper for the design requirements of the modern radar. The process of virtual verification of main-tainability is established at first. After that, the data preparation, simulation process and evaluation method areelaborated. Then the specific work content and requirements of every step are demonstrated and a complete solution to virtual simulation of maintainability for the radar system is formed. Finally, an example is taken to demonstrate the entire simulation process and the effectiveness of the method is verified.