For the requirements of multi-axial parallelism measurement in engineering,a method and a system are proposed to test the multi-axial parallelism.This system adopts off-axis asphere two-double light route,and designs a collimator with aperture 120 mm and focus 720 mm,realizing light weight and portability.Modular design and multi-target integration are used to test the parallelism of infrared,visible and laser optical axis in the same system.Image processing and automatic control technology are used to realize quantitative measurement of multi-axial parallelism.The testing error is controlled within 0.1 mrad.Compared with the CI test system,the results show that the optical axis parallelism test has good consistency,high accuracy and engineering application value .