Abstract: Abstract: Circular agricultural park can be an important measure to enhance the construction of ecological civilization and the green development of agriculture, and it is also an essential trend of green development theory in the field of agriculture. In the analysis of this paper, the material and energy flow (MEFA) were used to clarify the industrial structure of the park, master the practical operations of the industrial chain, optimize the resource allocation, promote the productivity efficiency of resources and energy, add the complementary chain of circular economy, increase the recycling utilization rate of the waste, which could make the economy of the agricultural park develop, promote the sustainable utilization of resource and environment protection as well. The Gansu National Agricultural Science and Technology Park was investigated in this study, the general information of the park and detailed data like the enterprise input, output and etc were obtained. Under field investigation, the material and energy flow in the park and appropriate index evaluation system were built to understand the status of the circular agriculture, and then the main factors that restrict the circular economy development in the park were analyzed. Based on that, we put forward the change approach of industrial chain, estimated the future status of circular agriculture in the park and analyzed the feasibility of the new circular economy development pattern. The research results showed that: 1) The resource productivity was 5 400 RMB/t, the ratio of recycled material was 51.75% and energy consumption for each unit of GDP was 0.038 t per thousand RMB, which indicated that the ratio of the clean resource utilization was relatively low and it was hard to reach a balance between economic development and ecological conservation. The productivities of some industries were limited, the resource allocation was not reasonable and the industry coupling was of low magnitude. 2) The park could enlarge the current productivity by importing food processing industry, promoting photovoltaics, biogas and processing projects for densified biomass fuel. And it could also increase the income and the production efficiency of resources and energy, decrease the environmental damage, boost the circular economy development of the whole park. 3) Based on the enlarging the industry scale and adjusting the industrial structure, the park should implement measures as followed: First, the environmental supervision and the distribution of new energy sources should be strengthened, and the clean energy such as photovoltaic power, biomass, etc., is encouraged to use; Secondly, it should have revolution on supply side, which meant that the economic orientation should be decided by the market demand, and blind production and bubble economy under saturated market should be avoided; Thirdly, it must pay more attention to make products demand-lead and avoid the superfluous administrative intervention; Fourthly, it should improve the scientific innovation of the park to make a good example under the 'enterprise-university-research' cooperation. Based on the above research results, the industrial structure after adjustment can not only give a resolution to the inherent waste, but also significantly promote the utility efficiency of the resources and energy of the whole park. It has reference significance to the development, planning and evaluation of circular economy of other industrial parks.