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In order to solve the problem of uneven distribution of machining allowance before aeroengine blade grinding, a method of machining allowance analysis and adaptive grinding path generation based on blank point cloud registration is proposed. The 3D point cloud of the blank is obtained by using the accurate scanning and mapping technology, forming the point cloud registration method of the blank/part mathematical model; Through the constraints of datum alignment and point cloud contour inclusion, the 3D machining allowance analysis of blank is realized; On the basis of the allowance distribution, the machining point cloud track is obtained through the sec-tion, the bead chain is sequenced for the track point cloud, and the continuous and appropriate grinding path is calculated to achieve adaptive allowance grinding. Finally, the grinding simulation is carried out in Vericut software to verify the effectiveness of the proposed method.