Abstract: The platform framework of highly mobile radar supports key equipment such as antenna pedestal and antenna array, its stiffness and strength optimization is very important and directly influences the use safety and measuring accuracy of radar. In this paper, optimization design for the platform framework of a highly mobile radar is carried out. Finite element method is used for simulation analysis of framework structure. The stress and deformation are evaluated, and optimizations are proposed for partial stress concentration. Then a stress test platform is applied to test the actual stress of the physical platform framework, the results agree with simulation.