Abstract: Construction of Guandi hydropower RCC gravity dam has the characteristics of large quantities, short construction period and difficulty of quality control. Supervising engineers controlled the construction quality of RCC in the aspects such as raw materials and concrete mixing, transportation, unloading, paving, rolling, etc. On this basis, according to the characteristics of RCC construction, supervising engineers carried out some targeting quality control measures which guaranteed the RCC construction quality effectively and good results were achieved.