The finite element model of the pipe connection parts of aircraft hydraulic system was established to study the influence of friction coefficient,tightening torque and axial assembly deviation on the sealing performance of pipe.The Latin super-cubic sampling of the value space of three factors was carried out,and a large number of simulation samples were obtained by finite element simulation calculation.The simulation data were fitted by the support vector machine regression model,and the finite element calculation agent model was obtained.The agent model was used to evaluate the influence of three factors on pipeline sealing performance instead of complex finite element calculation,it was proved that the evaluation results of the agent model were in good agreement with the finite element simulation results.The calculation results show that the sealing performance is lower with the increase of the friction coefficient when the tightening torque is fixed,and the sealing performance is increased with the increase of the tightening torque when the friction coefficient is fixed.The axial deviation has a certain impact on the sealing performance when the friction coefficient and tightening torque are fixed,and when the axial deviation increases from negative to positive,the sealing performance becomes better.The research result is of great significance for formulating reasonable assembly standards,effectively controlling the fault of pipeline system,and improving the reliability of pipeline system.