Abstract: Luming mining tailings pond leakage incident resulted in a large amount of molybdenum-containing tailings water leaking into the river, causing serious pollution of the downstream river and threatening the safety of drinking water source. Scientifically and effectively carrying out environmental emergency disposal was a difficulty of the on-site emergency response work. The emergency disposal decision-making, the emergency plan formulation and the project implementation results were systematically expounded, mainly including emergency goal formulation, water quality monitoring and analysis, emergency disposal ideas and engineering measures, etc. In the process of on-site environmental emergency response, through the implementation of measures such as plugging leakage points, dam blocking and interception, coagulation and precipitation, two major projects for pollution control and for pollutant concentration peak reduction and water purification were implemented to achieve the emergency goal of "not to allow standard-limits-exceeding water entering Songhua River". The successful experiences of emergency disposal of this accident was summarized, and suggestions for the prevention, control and disposal of environmental risks of tailings pond were put forward, so as to provide reference for scientific prevention of environmental risks of tailings pond and proper response to such sudden environmental emergencies.