How should the developing areas control the worsening of fishpond water pollution while keeping economy growth on track? The paper tries to provide a useful guideline for other water bodies pollution control in these areas. Based on the local government ruling idea transformation, a new strategy with execution at the core was proposed to deal with the eutrophic Dianchi Lake (DL) of China in paper. The local government changed development model through industrial structure adjustment, laying equal stress on environment and economy. Then, the management level has been effective improved through creating responsibility system for the leaders in charge of DL and its inflowing rivers. Meanwhile, multi-channel investment was strengthened and six comprehensive engineering was implemented for DL pollution control. After several years of practices, fishpond water pollution has been improved greatly and the economy of Kunming still keeps growing momentum during these years.