The test method of the bullet impact location based on a large area and parallel laser screen was studied. Taking the laser diode line generator as the light source, the parallel laser screen unit was formed by using aplanatic cylindrical Fresnel lens with long focal length. By splicing seamlessly with multiple parallel laser-screen units, the large area laser screen can be constructed. Because of the Gaussian profile of the luminous flux density along the transverse direction in a parallel laser-screen unit when a bullet with certain diameter passes through different transverse location of the unit, the photo detector obtains different signal. Therefore, according to the amplitude of the signal, the bullet impact transverse location can be subdivided within the width of a parallel laser screen unit. The feasibility of such subdivision scheme is verified by live firing experiments of 7.62 mm caliber. Experiment results show that the system has sufficient sensitivity to acquire signals of small objects. For the length of 10 m laser screen, the standard deviation of differences between this system coordinate measured data and bullet holes coordinate ones is 5.16 mm.