Risk control is an important issue when commercial banks plan to carry out supply chain finance. The prior academic studies on this theme has no research outcome from the view of herding behaviour. We first address the working mechanism of different subjects in supply chain finance, to describe the features and risks. Then, according to analysis separately about the imitation activities of core business and commercial banks, we define the risks of supply chain finance based on herding behaviour theory. In this respect, we also give some matching suggestions to control risks. Our results suggest that commercial banks should take into account all the factors including appropriate industry, stable core business and mature products integrated.