In a method and system for verifying manufacturing consistency of manufactured items, N point clouds of the manufactured items are read. A first point cloud is selected from the N point clouds, and each point of the first point cloud is projected onto a predetermined ideal outline for obtaining a nearest point in the ideal outline of each point of the first point cloud. Intersections of the N point clouds and each line formed by a point in the first point cloud and the nearest point of the point are further determined, and a vertical distance between each of the intersections and the ideal outline is calculated for obtaining a deviation value of each of the intersections. At least one outline is fitted according to the deviation values of each of the intersections and the at least one fitted outline is output to a display device.