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To optimize the allocation of the resources in a trilevel (provincemunicipalitycounty) operation command system for weather modification, a new operation command scheme is proposed according to the responsibility scope and the mission characteristics of weather modification offices at various levels. The provincial level is mainly responsible for plane precipitation enhancement operations, groundbased early warning for weather modification, operating information collection, and monitoring in the whole province. The municipal level is mainly responsible for the direct command of operational sites within the region. The main task at the county level is to carry out monitoring. The system embodies the peculiar advantage of the mode, i.e.， the direct commanding of operating sites by municipal centers, which gives full play to the technological advantages of the provincial plane operation and groundbased operational early warning and solves the problem which is caused by the less staff and weak technological force of countylevel weather modification offices. Also it realized the trilevel resource sharing, solved the problem of time delay while receiving operation instructions，and improved operational timeliness and performance.