Regarding the construction of the tunnels of Shanxi Xiaolangdi Yellow River Water Conveyance Project, one of Shanxi Great Water Supply Network Projects, discussion is made on how to safeguard staffs and facilitates on the job site, [JP4]so as to avoid disasters that may occur in construction of tunnels by means of drill and blast. Some [JP]new disasterprevention concepts and measures are proposed, which consist of the sixfactor precautions to be kept, ten improper thoughts to be abandoned and three relationships to be well tackled. The six factors include man power, construction machinery, construction materials, tunnel construction procedures, construction areas and working periods; The ten improper thoughts include aimlessness, carelessness, paralysis, luckiness, slackening, impatience, curiosity, flaunt, being rash and selfsatisfaction; The three relationships refer to the relationship between safety and progress, the relationship between safety and investment, and the relationship between safety and quality. It is suggested that in the bidding stage, the safetyrelated working items provided should be in detail, tentative safetyrelated working quantity should be worked out and competitive quotations in unit prices and total prices should be adopted, and that the safetyrelated working items and the safetyrelated working quantities can be adjusted in the construction stage. Finally, it is suggested that automatic monitors should be deployed to supervise and predict possible dangers during tunnel construction.