Abstract: In order to solve construction problems of a hydraulic tunnel under various complex geological conditions, taking the Shizishan tunnel of Water Diversion Project in Central Yunnan as background, this paper deeply analyzes main engineering geological problems and construction organization difficulties during the construction process by means of on-site investigation and monitoring, proposes the key intelligent construction technologies, and the following conclusions are obtained: (1) as for the super-long, high-risky tunnel constructed by the drilling and blasting method with multi working faces, the safe, rapid and efficient construction can be achieved through mechanization, automation and informatization from the aspects of method selection, machine matching, geological prediction, disaster monitoring, harmful gas monitoring and construction ventilation; (2) through accurate prediction of high-risk sources, targeted technical measures, intelligent monitoring means and informatized early warning mechanism can be taken to achieve the purpose of informatized pre-control of construction risks; (3) according to characteristics of complex geological conditions, high construction risk and high construction organization requirements of Shizishan Tunnel, the software platform of intelligent site management system should be used to realize multi-level,all-round, multi-dimensional and comprehensive intelligent management.