Abstract: To reveal the action of the oriental mole cricket (Gryllotalpa orientalis Burmeister)’s pronotum in digging caves, 3D-scanner was used to obtain the outer contour data of the oriental mole cricket’s pronotum in this paper. The geometrical surface of the pronotum was reconstructed by reverse engineering software. Extracted The section curves of the pronotum was extracted and analyzed using Matlab software to got the curve fitting expression. The results showthat, the curvature change of the vertical section is small, the change of every curvature of the vertical section and cross section is basically in accordance. The results indicate that the particular geometrical morphology of the oriental mole cricket’s pronotum plays an important role in digging caves. The research can be a foundation for the research of the hole reaming working parts in construction machinery.