SME difficulties in financing have always been a significant factor of restricting their development. In recent years some relative government department issue a series of policies and put them into act to solve this problem. Among all these measures, however, which one is most effective? There’s no accurate answer till now. This Paper uses the data coming from questionnaires of SME and researches with them empirically. According to the result, enhancing the development of guarantees and perfect credit rating system are more effective than direct government instruments. The conclusions of the research provide theoretical basis for our government’s policy – making and have important relations for solving the financing problem of SME.