The optical and mechanical structure of the position solution testing equipment is more complex, the equipment needs to be calibrated after the installation of visible optical axis and laser optical axis. A kind of simulation calibration method for the detection optical axis of the position solution testing equipment based on the principle of parallel to the optical axis is designed. The composition and the calibration principle of the system are introduced in detail. The results show that the calibration method has the advantages of high precision, simple system layout, facile operation, and can quickly and accurately realize the purpose for the optical axis simulation calibration of the position solution testing equipment.