It was believed that the main obstacle for the development of under developed countries is the lack of capital investment, which could lead them into the vicious circle of under development. Therefore, flow of capital from abroad is the only solution for getting free of the vicious circle. Nowadays, the indicated belief quite changed, so that in spite of the necessary role of the capital in development process of countries, but it isn't sufficient factor at all in this respect. So that, some developing countries proved that under condition of limited amount of internal capital, development achievement is possible if using suitable methods and efficient financial systems to mobilize the small but numerous idle capitals available across the country. Because of complimentary role of the microfinancial institutions in mobilization and allocation of financial resources, especially in the rural areas, settling down these institutions has a very high priority in development plans of monetary sector of the country.In this study, by reviewing the performance and successful experiences of Grameen Bank of Bangladesh and the funds of Gharz Al Hasana in Iran, a comparison have been done among the indicated institutions through selected factors such as degree of influence, financial self-sufficiency, the ratio of deposits to loans, value added to given credits, and value added to the number of staff. Also, we tried to find suitable solutions for the problems facing micro finance in the rural sector of Iran. The study shows that the influence indices, self sufficiency and the ratio of value added to credits of the Gharz Al Hasana funds in rural area of Iran are less than similar indices for Grameen Bank of Bangladesh.