This paper makes some preliminary studies on three relations.One relation is between the construction and operation of Minjiang River water conservancy project and the instability hazards of littoral slopes. The second is the earthquakes induced by Shuikou Reservoir. The third is the downstream channel stability behind the dam and its harmfulness. The results show that the instability of the reservoir banks is obvious correlation with the water conservancy project operation and the hazards frequencysignificantly increases as the operation continued. In addition, the impounding and hydration of Shuikou Reservoir are also the important factors inducing an earthquake.