Panshan County, Liaoning Province, combines rice and vegetable planting with aquaculture to form a diversified composite ecosystem of "rice, crab and vegetable". By adopting the new technology of "big ridge and two rows, early release and intensive cultivation", not only the rice yield and efficiency are increased, but also the quality is improved. The Eriocheir sinensis in paddy field can grow into large-scale high-quality crabs, and the comprehensive economic benefits are obviously improved. The benefits of crab-raising paddy field are increased compared with those of crab-free paddy field 1088. "Panshan Model" closely combines rice planting with crab breeding, which improves the utilization rate of land and water resources, stabilizes farmers' enthusiasm for growing grain, reduces production costs and reduces the use of chemical fertilizers and pesticides. At the same time, the economic benefits are obviously improved, and the social and ecological benefits are remarkable. "Rice+aquatic products = food security+food security+ecological security+increasing farmers' income", namely 1+ 1=4. This technology is of great significance for ensuring the stability of China's basic grain fields and ensuring the food security strategy. It is a veritable resource-saving, environment-friendly and food-safe industry.