Abstract: Affected by the disease,the Naghu Reservoir cannot operate at normal water level,it operateds at low water level all year round.The flood control and irrigation functions of the reservoir is not functioning properly,which is not conducive to the flood control and farmland irrigation of villages along the downstream.In order to restore the flood control and irrigation function of the reservoir,it is necessary to eliminate the disaster and reinforce the reservoir.The geological investigation work of the disaster elimination and reinforcement engineering of Nawu Reservoir is carried out,so as to find out the causes of the reservoir disaster and provide geological suggestions and basis for the design of the reinforcement engineering.

Key words: Small reservoirs,Disaster elimination and reinforcement,Geological investigation