Abstract: Based on the data of the sewage treatment plant and regional planning data, we analyzed the environmental feasibility of reclaimed water reuse for Pingtan Jinjingwan sewage treatment plant by using the empirical model, the complete mixed attenuation equation of the lake and the analytical solution equation of the two-dimensional diffusion equation. The quantity and quality of reclaimed water can meet the needs of lake landscape water, flushing water, greening water and road watering. After the reclaimed water was discharged into the lake and sea, the water quality of the sea can meet the water quality standard of the environmental functional area around the sea area. In case of accidental discharge, water quality of a small area in the adjacent waters exceeded the water quality standard of the sea functional area, so corresponding measures should be taken to strengthen the sewage treatment plant management and prevent accidental discharge. With the development of urbanization and industrialization, the use of reclaimed water will tend to be more diverse.