We establish the comprehensive evaluation indicator system for sustainable development of micro-credit, constituted by the profitability ratio, financial constitution ratio, loan quality ratio and operating efficiency ratio. Taking the case of micro-credit of China Foundation for Poverty Alleviation, we measure the current situation of sustainable development of micro-credit. As far as we are concerned, the composite index of sustainable development of micro-credit shows the growth trend on the whole. Finally, in order to further improve the sustainable development of micro-credit, provide farmers with better financial services and enable more farmers to benefit from micro-credit, we put forth the following recommendations: strengthening technological innovation to reduce costs and improve operating efficiency and profitability of the micro-credit; strengthening risk control to improve the quality of loans; providing all-around non-financial services to lay the foundation for the sustainable development of micro-credit; setting an appropriate level of interest rates to improve the profitability of the institutions.