Since the reform and opening up,the medium and small enterprises in China has made rapid development,and played an important role in our country's economic growth and social development. But for a long time,the national governments pay more attention to the big enterprise in the policy level,plus small and medium-sized enterprise's own disadvantage,so it is difficult to realize sustainable development in medium and small-sized enterprises. Based on the current economic situation,this article analyzes the current survival situation of small and medium-sized enterprise,and then reflects the national and local law and policy of promoting the development of small and middle-sized enterprises,and finally presents the relevant policy Suggestions,in order to realize the sustainable development of small and medium-sized enterprises. <<