The orgnizations which provide financing support to the Japanese small and medium-sized enterprises are mainly the small and medium-sized enterprise group and the national life group of “Shoko cicc” and “Japan public treasury”;The credit guarantee support to small and medium-sized enterprises is provided by 52 credit guarantee associations and the National Credit Guarantee Associations;The reinsurance for credit guarantee of small and medium enterprises is provided by the small and medium-sized enterprise group of “Japanese public treasury”. Under the guidance of a complete legal system of small and medium-sized enterprises，these policy-based financial institutions which provide financing support and credit guarantee for the development of small and medium-sized enterprises cooperate and make a mutual complementation，constitute a impeccable policy-oriented financial support system for Japanese small and medium-sized enterprises. This system has increased the effective information stock through its function of information collection and transmission;has increased the available financial resources for small and medium-sized enterprises through its function of replenishment of fund;has allocated part of financial resources of commercial financial institutions to small and medium-sized enterprises through its function of channel funds. The policy-based financial support system for small and medium-sized enterprises has made an effective supplement to the whole Japan’s financial system and its function.