At present, environment of cultivated land has been influenced unfavorably by single continuous cropping in paddy field. In the field experiment of five years in this paper, ecological analysis based on paddy-field rotate system and continuous cropping was studied in the view of soil physical and chemical characteristics, crop output variety, occurring and developing rule of plant diseases and insect pests of farmland, power-flow and state of equilibrium nutrient. The results show that, compare with single continuous cropping, firstly, paddy-field rotate system has improved soil physical and chemical characteristics apparently. Secondly, yield of the rotate system was increased .Moreover, the overall initiative productivity, light energy using rate and assistant energy using rate was increased by 17.47%, 9.87%, 5.0% respectively. Nutrient using rate of N, P, K was also improved in the rotate system. Thereby, optimizing pattern and complex cultivating pattern have been suggested about rational crop rotation.