In order to study the low temperature characteristics of reciprocating spring energized seal ring,two-dimensional axial symmetric model was developed by equivalent spring.ANSYS was used to analyze the stress and friction force of the PTFE jacket of spring energized seal ring during assembly and medium pressure at room temperature,from normal temperature to low temperature and during low temperature pressure process.The results show that the jacket inside and outside lip sealing face is the main pressure bearing area at normal temperature and low temperature,and the stress,contact pressure,contact width and the friction force of the PTFE jacket inside and outside lip sealing face are increased with the increasing of medium pressure.The contact at low temperature is larger than that at normal temperature,but the contact width is smaller than that at normal temperature,and the friction force is 2 to 3 times of that at normal temperature.The simulation results show that the spring energized seal ring has good sealing performance at room temperature and low temperature.The correctness of the simulation analysis results is verified by the sealing performance test under normal temperature and low temperature of helium gas and low temperature liquid nitrogen,and the good working performance of the spring energized seal ring is also verified.