As a non-universal test equipment for aviation model product development, special test equipment needs to be supplemented with corresponding measurement assurance to ensure that the development of special test equipment is synchronized with model product development, and the test data of special test equipment is accurate, reliable and authentic. This article focuses on the whole process of the development of special test equipment, and accurately grasps the measurement assurance characteristics of the special test equipment. The guiding principle of measurement assurance is “incorporating equipment development, strengthening the development process, and focusing on key aspects of control”. This paper systematically sorts out the key tasks of the whole process measurement assurance for the development of special test equipment, and puts forward the rationalization suggestions for the measurement assurance work of special test equipment.