Based on introducing the form and the principle of the system for large-aperture collimator, the indoor emendation measurement of excessive optical axis parallelism for photo-electricity measuring equipment was done using the measurement principle. The optical axis parallelism emendation for TV/IR/Laser was implemented through fabricating standard laser target and collecting laser spot of the laser target by sensitive paper, so that the optical axis non-parallelism of TV/IR and Laser meets the technical index requirement, the good effect is realized.