With the rapid development of global economy, the reform and opening up policy of China has provided good opportunities for the vigorous development of small and medium-sized enterprises (SMEs). And SMEs have become the important force of sustained, rapid and healthy development of China's economy. Moreover, SMEs have played an irreplaceable role in promoting China’s economic development, absorbing labors and promoting market prosperity. But with the global economic integration, the domestic small and medium-sized enterprise’s operating environment is facing tremendous changes and more intense competition. This paper introduces the sources of SMEs’ financing, analyzes its financing difficulties and causes from its sources, and aims to benefit the development of SMEs in the near future.