Abstract: Special equipments are very important equipments with potential danger, which are widely used in industrial production and peoples daily life. Nondestructive testing(NDT) plays one of the most important roles in insuring manufacture quality and operation safety of special equipments. The NDT techniques used for raw material, manufacture and in-service testing of special equipments are reviewed, such as radiographic testing, ultrasonic testing, magnetic particle testing, dye penetrant testing, eddy current testing, acoustic emission testing, metal magnetic memory testing and magnetic flux leakage testing. The application purpose of the NDT techniques are indicated.