Abstract: A test equipment for boresighting the three optical axes of the groundbased observing and aiming system that consists of laser, day light, IR(or low level light) sensors is introduced. Its test principle and process to measure the optical axes boresight of the three sensors mentioned above are described in details. During the design of the line graticule, we did not use the ruling technique on glass, but selected Wwire to make the LOS and welded two electrodes at the two ends respectively. This design can avoid any possible error caused by the replacement of the crossline graticule observation when a multispectral optical system is tested. This equipment provides a foundation for precision adjustment by detecting and testing of the optical axis boresight in the multispectral optical systems, accordingly making the optical axis bore sight of the three optical sensors fulfill the boresight accuracy requirement of the system instrument and ensuring the direction consistence of observation aiming and rangefinding.