The development of oversea technique for construction of hydroelectric engineering is briefly described in this paper. Some important aspects on oversea hydroelectric technique, including the physical exploration, high dams and seismic resistance, optimum design on layout of hydropower houses, energy dissipaion in spillway tunnels, prestressed concrete lined tunnels, dam monitoring and repair of old dams, etc, are also described. Finally, some lessons from the comparison between Chinas and oversea hydroelectric techniques are suggested.