please help me modify the grammar mistakes !thank you very much! This research is to explore the business model used by the U.S. community banks in order to understand their applicability to the Chinese Rural Commercial banks in promoting their sustainable development. Rural Commercial Banks, as the important parts of the financial system, have played a positive role in serving the local economy. Under the background of China’s economic development, it is necessary to develop Rural Commercial Banks，in order to promote balanced economic development, and to better meet the financing needs of small enterprises and the rural construction．The comparative analysis of business model shows that，community banks choose business model based on relationship lending，mainly serving community residents，farmers and small and medium-sized enterprises．They focuse their business areas in the local and surrounding areas，in order to facilitate the collection and use of local soft information．They provide humanized service and products based on the traditional deposit and loan business，to establish a close and stable relationship with customers． Based on the analysis of business model，The proposal for their sustainable development is focusing characteristic orientation in business model, for example: small and medium-sizing for the customer structure, localization of business objects, individuality of the product service.