The following paper aims to explain the different factors that contribute to the financing the economic activity of small and medium enterprises (SMES) in China. The reason for analyzing these types of companies revolves around the fact that they have benefitted its nation´s economy growth. First, an analysis was done in the formal sector, where certain deficiencies were identified specifically in the legal and financial systems) and how these deficits hold back the access needed for SMES to join conventional mechanisms of finances. Afterwards, a study of the existence of a financial system, which is parallel to the formal system, emerged, only to realize that this parallel system helped these companies to grow. This is known as an informal economy based on connections and reputation, which acts as a substitute for the traditional formal way. Due to the success of this economy, despite the deficiencie within the legal system of the country, it is important to contemplate and understand the elements which allow this to be sustainable through time. Lastly, various questions arise concerning the future of China as a global economic power. So it was proven that this informal economy is the main reason for their economic growth, but the question to be asked is, until when can this country relay on informality for its success?