Abstract: Aiming at the shortages on quantity and speed existed in the tunnel blasting design now mainly completed by the artificial method and the CAD, the composition and structure of intelligent system for tunnel blasting design was studied. According to the characteristics of tunneling blasting design and construction management, the composition of intelligent system for tunnel blasting design was determined by adopting the methods of both software engineering and artificial intelligence, which consists of knowledge base, database, reasoning machine, human-computer interaction system, explanation organization. The function modules including the system management, intelligent calculation of parameter, blasting data, primary design, construction design and construction information management were established, and the data flowing chart of tunnel blasting design was put forward. The self-adapting arrangement of the blast holes on tunnel face is realized. The system provides three kinds of design method, such as traditional, artificial intelligent and complete intelligent designs. Design results of the example of tunnel blasting show that the blasting design system can obtain the high-quality design diagrams accurately and quickly which include the blast-hole arrangement, the manual of arranging blast holes and the blasting order, etc.