This paper introduces a vehicleborne twoaxis servo system with gyro northseeking orientation.The platform servo structure and the gyro northseeking scheme are briefly described. Starting from the twoaxis servo structure, the optimized overall Ushape frame structure is obtained by using the ANSYS finite element analysis and simulation. The experimental results show that the mechanical shafting error distribution method the platform is correct, and the designed servo platform meets the accuracy requirements of the system and the vehicleborne.