We will improve contingency plans. We will do a good job in optimizing the plans, and make them concise, professional and practical. When preparing the plans, we should make comprehensive emergency plans, special emergency plans or on-site treatment plans according to the level, characteristics and nature of risk categories, and highlight the pertinence, practicality, and scientific nature of the plans. Organize the evaluation of the emergency treatment effect, find out the problems existing in the emergency plan, and constantly revise and perfect.