Abstract: Low loss and stable phase microwave coaxial cable is a kind of RF coaxial cable whose phase characteris-tics change little with temperature and bending compared with ordinary low loss cable. The test method of temperature phase stability of microwave low loss and stable phase coaxial cable is divided into cable temperature phase stability test and component temperature phase stability test. In this paper, the temperature phase stability test method of mi-crowave low loss phase stabilized coaxial cable is introduced in detail.