Abstract: Due to the special geological environment conditions, the development of geological disasters in our province, coupled with economic growth, urban expansion, rainfall increase and other factors in recent years, the number of geological disasters and economic losses are on the rise, so geological disaster prevention and control is particularly necessary. In order to fully understand the relationship between geological disaster prevention investment and social economic development, this paper analyzes and studies the current situation of geological disaster, geological disaster prevention and control investment and economic development data in recent ten years, establishes the overall income function under the fixed economic investment, and holds that although the geological disaster prevention and control effect in Qinghai Province is good in recent years, from the overall point of view, the geological disaster prevention investment in Qinghai Province is low and fails to reach the best profit point. Therefore, the relevant departments should pay attention to the prevention and control of geological disasters while taking into account the economic development. With the economic growth, appropriate adjustment of prevention input can not only effectively control the loss of geological disasters, but also guarantee other social benefits.