There is a phenomenon of intense utilization with less maintenance in the development and utilization of the low hillocks in the south red earth region.Taking the South Scientific Demonstration Base of Fruit Industry in Shanggao,Jiangxi Province as an example,we analyzed effects of circulated economical system establishment and biogas ecological engineering construction to improve soil organic matter of the low hillocks in the region.Our study illustrates that interplant green manure may remarkably increase soil organic matter content,and application of biogas fertilizer may greatly improve soil organic matter in a relatively short time.