In order to study the sealing performance of U shaped metal sealing ring in different working conditions,ABAQUS was utilized to establish the two dimensional axisymmetric model of the metal sealing U ring.Influences on the Von Mises stress,the size and distribution of the oil seal contact pressure and the contact width in the condition of static seal resulted from changes of operation parameters such as the initial amount of compression,working pressure and working temperature,were analyzed.The results show that in working condition,the maximal Von Mises stress is less than the yield limit and the maximal contact pressure satisfies the seal requirements,and 〖JP2〗the sealing performance can be improved by increasing working pressure appropriately in low temperature.According to the results,the limit working condition of the sealing ring was put forward,which has guiding significance on design and use of the U shaped metal sealing ring.