Abstract: To improve static performance indicators of weapon fire control system, a static testing system was developed to test loosened quantity of cannon barrel, transition process quality, rigidity, drift velocity, and maximum moving speed and other parameters. An optical measuring head was used to capture the images of muzzle relative motion on the coordinate by a relatively method, the parameters were calculated accordingly. Elastic sleeve was used to achieve reliable installation and easy removal of the static measuring head. Results show that: In -30℃～+50℃ environment, the modulation transfer function (MTF) value of the optical system is more than 0.6, which is closing to the diffraction limit; When 2=9.15，f＝50 mm, the static angular accuracy 0.2 mil, which meets the technical requirements. The mechanical fixture is suitable for fixed connection with 100 mm,105 mm and 125 mm artilleries. The system can not only measure some parameters of XX model tank barrel, but also be widely used in anti-aircraft artillery, armored vehicles, shipboard fire control systems, tanks and other weapons.