Abstract: This paper extractted the longitudinal profile curves which could be used for young female somatotype, including sagittal and coronal contour curves. Establishing a method of young woman shape classification based on the curvature radius of contour feature points. On the basis of GB body shape classification, subdividing young female body shape furtherly, analyzing the characteristic of the curve radius of curvature from the perspective of the longitudinal profile curve shape, using K-means clustering algorithm for dynamic clustering, and regarded the pseudo F statistics as a discriminant function to determine the optimal class number, the final longitudinal shape could be divided into 8 classes, quantitative distinguishing the young female longitudinal size differences, and put forward a new shape identification: "national standard body shape + longitudinal body shape".

Key words: sagittal plane, coronal plane, radius of curvature, K-means clustering, psrudo F statistics, somatotype