The weld structure is widely used in civil aircraft systems because of its good connectivity, light weight and easy processing. However, the discontinuity of weld structure may cause stress concentration and fatigue failure. In this paper, a type of aircraft weld pipe connector was taken as the research object. Firstly, the failure region, requirements of weld process and general failure mode were introduced. Then, solid elements are used to model the weld connector, detailed FEM modeling requirements of weld and weld toe and mesh convergence requirements are given to avoid stress concentration. In this paper, the vibration environment curve specified in RTCA/DO160 was selected for vibration excitation load environment. The stress response PSD was analyzed with Abaqus software PSD module. The fatigue damage model of three interval method and Miner linear damage theory were used to analyze the fatigue life result.