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To integrate the CAIP system with the CAD system,a sampling approach of measurement points for CMM based on the 3D digital model of product is proposed. The method identifies shape and boundary information from IGES files with respect to the product. After that,it carries out special mechanism for each type of surface shape,to acquire measurement points automatically,based on algorithm of combining the even sampling method with the equal curvature sampling method. In addition,the delete of invalid measurement points is performed by transforming the judgment of membership of the measurement point and the cutting area into the parameter plane of the surface. Practical examples of generating measurement points of typical aircraft shapes show that the proposed approach can be applied to the measurement plan of aircraft shapes effectively. 