Abstract: Geological disasters occur frequently in construction of sandy dolomite tunnels, in particular, the construction safety risk of water-rich sandy dolomite tunnels is high, which seriously restricted construction period and increased investment.In order to study the internal relationship between geological disaster risk and geological environment of sandy dolomite tunnels, taking Yuxi section of the Central Yunnan Water Diversion Project as an example, the geological disaster cases of sandy dolomite tunnels were deeply studied by statistical analysis method.The results showed that there were three types of geological disasters in the sandy dolomite tunnel, including collapse, water inrush and water and sand gushing; the main influencing factors of geological disasters were fault or compression zone, external water pressure and catchment area per unit length of the cave; according to the geological conditions of the disaster, the geological disaster risk level of the sandy dolomite tunnel was divided into four levels, extremely high, high, medium and general.The research results can provide technical support for selection of construction treatment measures and the arrangement of tunnel line schemes for sandy dolomite tunnels, and provide reference for the investigation, design, construction and management of sandy dolomite tunnels.