The defense industry is composed of related companies involved in the field of defense investment, mainly including aviation, aerospace, weapons, ships, information security and other sub-sectors. The environmental test standard of military equipment laboratory is the national military standard GJB-150A, which includes the following tests: low air pressure (altitude) test, high temperature test, low temperature test, temperature shock test, solar radiation test, rain test, damp heat test, mold Test, salt spray test, sand dust test, explosive atmosphere test, immersion test, acceleration test, vibration test, noise test, shock test, shell vibration test, wind pressure test, ice accumulation/freezing rain test, tilt and swing test, temperature- Humidity-vibration-height test, vibration-noise-temperature test, fluid pollution test, explosion separation shock test, acid atmosphere test, ballistic shock test, ship shock test.