For light-arm infrared optical sight stability testing requirements, we design a two-dimensional electrical-turntable platform based on Newton′s reflex infrared system. Electrical control was established based on CATIA three-dimensional model of two-dimensional precision turntable model. The two-dimensional precision turntable model was using small two-dimensional U turntable structure, driven by a DC servo motor directly. 24-level axial angle encoder was used for angle measurement. Through finite element analysis software PATRAN on the turntable platform, key components of the thermodynamic analysis and modal analysis were conducted, obtaining the turntable stress distribution nephogram. The results show that the design scheme is feasible and reasonable.