In order to build an emergency system for emergency accident of water pollution, the technological ideology of active emergency protection was put forward. The fixed point pollution source was taken as the study object and the diffusion model of water was used to set up the new method of water resource protection area division in active mode. Based on this new method, the water protection system with active control was built and the roles of different government departments in this system were given. The various active control technologies, such as storage tank for emergency accident, zero discharge, etc, discussed in this paper will help to water pollution control for emergency accident. The active mode method provides reference for water resources management.