In order to study the influence of pipeline assembly deviation on the sealing performance of pipeline connectors,the pipeline connector model was established,and the conditions for determining effective sealing were proposed.Static simulation was used to analyze the friction coefficient of the pipe joint contact surface and the pipeline assembly deviation (axial,radial and angle) on the sealing performance of pipe joint connectors.The results show that the increase in the tightening torque will enhance the sealing performance,but if a certain limit value is exceeded,the pipe connection may be damaged.With the increase of he friction coefficient between the pipe joint and the pipe contact surface,the sealing performance is decreased.The axial deviation in the assembly process will result in the decrease of the sealing performance of pipeline connector,or even lose the sealing performance.Radial deviation and angular deviation will slightly reduce the sealing performance,but the pipeline will undergo plastic deformation.A pipeline sealing test system was established,and the test results verified the correctness of the simulation analysis results.