To satisfy the requirement of preserving details in equipment geometric model simplification, a novel 3D geometric model simplification method based on preserved vision feature was put forward. In the algorithm, a new error metric rule based on the geometric importance (including the length of the edge and the vertical curvature) and change error of a half-edge was proposed to determine the order of edge collapse in 3D geometric model simplification. And then, a vertex micro-adjusting algorithm was adopted to modify the local details of the 3D geometric model. Experimental results show that the proposed simplification method is practical and convenient, and can effectively preserve model details and obviously improve model distortion in 3D geometric model simplification.