Regarding the gearbox of a certain type high speed train as the research object. the simulation and analysis of the complex internal flow field during its normal operation was carried out. Three-dimensional model of the gearbox oil lubrication was built. and its internal flow field was calculated by using professional fluid simulation software Pumplinx. https://www.spidertattooz.com/Horse-Painting-3-Piece-HD-Multi-Panel-Canvas-Wall-Art-Frame/