The excavation quality and progress control of slope protection layer of dam shoulder groove is of great significance to realize the safe and efficient construction of hydraulic engineering.In view of blasting excavation of the slope protective layer,a three-dimensional adaptive layout algorithm of the blasting holes is proposed and a three-dimensional geometric calculation model based on the algorithm is established,which consider the characteristics of the protective layer,such as multi-profile,multi-inclination and high excavation quality requirements.Using C#WinForm to achieve human-computer interaction interface design,a three-dimensional automatic layout system of the blasting hole is developed.By coordinating the two-dimensional layout of the blast holes in the top,bottom and side excavation contour surface of the protective layer,and using the offset contour method to determine the row relationship of the blasting holes in each contour surface,the three-dimensional automatic layout of the blast holes is realized,which effectively solves the adaptive layout problem of the contour holes in the blasting excavation of the protective layer of the dam abutment groove slope under the complex contour,and the main blast hole layout problem when the bottom end of the blasting hole does not fall on the bottom excavation face under the condition of the excavation slope.The design results of engineering examples show that the application of the system can automatically,quickly and efficiently complete the layout of blasting holes of the protective layer of the abutment groove slope.