Abstract: The method of systematic analysis was used in this study. More attention was paid to the features of energy flow and nutrient cycle in crop and livestock subsystem before and after ecological agriculture construction was introduced in Liuhe village, Qingan county of Heilongjiang province. The results of analysis showed that the construction of ecological agriculture in Liuhe village provided a beneficial experience for the improvement of agroecosystem in Songnen plain and the development of the this lower income area. The objects of both improving agroecosystem productivity and protecting environment can be achieved at the same by the rational regulation of energy flow and nutrient cycle.