A mathematic method for ensuring that motor-based optoelectronic tracking equipment works high accurately was introduced. The two-axis inclinometer was settled on the base,and the inclinometer examined the planeness of base in real time. According to the data of two-axis inclinometer,the optoelectronic tracking equipment should change the angle of horizontal axis and vertical axis. The mathematic model was established and the working principle was analyzed. Then,the formulas of horizontal axis’ transfer and vertical axis’ transfer were worked out. The CAD model was built and simulated with virtual prototype technology. Analysis and simulation prove that the mathematic method could keep tracking precision of motor-based optoelectronic tracking equipment.