Abstract: Aiming at the detection problem of optical axis parallelism of various sensors in modern photoelectric weapon systems, a high precision multi-optical axis parallelism detection method based on LABVIEW was proposed. The method was based on the principle of the collimator with large diameter and parabolic mirror. The software design of the detection method was realized by the high efficiency modular function of LABVIEW and the powerful image processing function of LABVIEW-Vision. It is verified by experiments that the error of this test method is less than 5″, which meets the requirements of multi-optical axis parallelism test of photoelectric weapon systems.