In this paper, the main components of the electric fan are designed in three dimensions by using NX, and the movement simulation and injection mode design of the fan blade are carried out. Its main contents include:(1) three-dimensional design of the electric fan;(2) 3d design, assembly inspection, view inspection, system optimization, etc. ;(3) fan simulation based on NX platform;(4) research on virtual assembly theory and key technologies;(5) complete the design of injection mold for electric fan blade.In this paper, three-dimensional modeling, computer platform assembly, motion simulation and planar CAD software are used to design the injection mold of fan blade.