Abstract: Based on the investigation data in 1938〖KG-*2〗-〖KG-*7〗2007 and by using the evaluat ion method of ecosystem service value and the ecological footprint theory, the e cosystem service value and ecological footprint in Zhifanggou watershed of Loess Hilly Region were calculated, with the interactive relations between agroecosys tem and economic system in the watershed analyzed. From 1938 to 2007, Zhifanggou watershed experienced three development stages, i.e., ecological environment de struction with backwardness of economy (1938〖KG-*2〗-〖KG-*7〗1975), eco-envir onment restoration with rapid development of economy (1975〖KG-*2〗-〖KG-*7〗200 0), and well-maintained ecological environment with stable growth of economy (2 000〖KG-*2〗-〖KG-*7〗2007). The interactive relations of the eco-economic syst ems manifested as ecological deterioration, eco-economic adaptive regulation, a nd eco-economic benign interaction.

Key words: arsenic mining area, carbon source metabolism, Biolog, canonical correspondence analysis.