As an essential component connecting various parts of the lubrication system in areo-engine, the internal flow characteristics of the curved pipe play a vital role in the normal operation of areo-engine. In this paper, a geometric and mesh model of oil flow in the curved pipe are established, and the flow characteristics of oil in the curved pipe are numerically calculated using the Detached Eddy Simulation (DES) model. The influence of curved pipe angle and inlet oil velocity on the oil flow in the curved pipe is discussed separately. The results show as follows: (1) The curved pipe angle significantly affects the distribution of oil flow field in the pipe, and with the increase of curved pipe angle, significant flow separation phenomena occur in the outlet section; (2) The influence of inlet oil velocity on the distribution of oil flow field in the pipe is not significant. The results of this paper can provide reference for the design of pipelines in aero-engine lubrication system.