Aiming at the disadvantages of high cost, long time cycle and many influencing factors in the traditional test method, a virtual test method for anti-aircraft gun weapon was proposed. The test principle of the method is introduced, the system composition of the test is given, the virtual test true value calculation model is established, and the test idea is put forward. The test results show that the method is feasible by comparing the range test and virtual test of the fire control system of an anti-aircraft gun weapon.