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The weather background and the protectivearea design of artificial rain mitigation during the opening ceremony of the 11th Chinese National Games are introduced briefly. For technical support, the demands and countermeasures of targetareas excessive seeding by rockets and 37mm cannon on monitoring and forecasting, airspace guarantee, instruction transmission, launching operation, ammunition supply, etc., are analyzed. At the same time, the main tasks at the key time nodes for emergent weather modification service are introduced, and the technical key points and task requirements of operation decisionmaking, plan implementation, crossregion cloud seeding, etc. are discussed. The application in experiments before and during the opening ceremony of the 11th Chinese National Games indicate that the design of above technical procedures satisfies the technical demands of artificial rain mitigation.