Abstract:The Poyang lake is the biggest Chinese fresh water lake. Ecological security of the Poyang lake district has the important ecological significance, economical significance, social significance and international significance. At present, ecological security of the Poyang Lake district is facing a series of problems and challenges, e.g., water and soil erosion, land desertification, the flood and drought disaster, the decrease of area of cultivated land at sharp speed, the farmland rat damage, the farmland salinification, the soil degeneration, the environmental pollution, the biological invasion, the biodiversity declines, food pollution, schistosomiasis, and the poverty of rural economy and the farmer's low quality status. In order to guarantee the ecological security of the Poyang Lake district in the new century, the ecological construction must be strengthened, and measures and countermeasures will be taken effectively, which include: to improve the ecological quality; to develop the afforestation; to strengthen the water conservancy construction; to turn the farmland into the lake; to adjust the industrial structure; to implement the clean production; to develop the circulation economy; to increase the material investment; to draft the ecology plan; to perfect legal laws and regulations; to pay attention to the international exchange and international cooperation.