No tillage rice - turtle - fish - snail ecological planting and breeding model is a new technology model not only consistent with the requirements of conservation tillage but also conform to rice green and efficient production concept. The scientificity of no tillage rice - turtle - fish - snail ecological planting and breeding model was analyzed from the biological point of view using the methods of liquid screw principle and principle of ecological food chain. The rice planting,feeding animal management,pest prevention and weed control,key technology of turtle breeding,were introduced in det...