Abstract: With the development of science and technology and military strategy, the equipment platform will widely adopt new technologies such as stealth and radio frequency integration, as well as new institutional information system and directed energy technologies to meet the requirements for performance and system combat capability. The complex equipment platform will face the complex electromagnetic environment effects (E3) problems formed within the platform, the information system and the battlefield high-power attack environment, lighting and static electricity. The E3 control and quantitative design of the complex equipment platform through the computational electromagnetics (CEM) is the key means to realize the precise electromagnetic design of the complex platform, and it is the an effective way to ensure the ship platform adapting to the external complex electromagnetic environment. To this end, this paper focus on the application and challenges of CEM in the quantitative design of E3 of the complex equipment platform, and comprehensively summarizes the application status of CEM in response to E3 at home and aboard. The new problems, challenges and effective suggestions by the control and quantitative design of E3 of the complex equipment platform are proposed.