Circular business. E-commerce is the world's leading Internet model. This business model is based on circular economy and combined with the ultimate development of e-commerce to form its own business model. E-commerce belongs to circular commerce. After Yahoo's portal model, Amazon's BTC model, EBAY's CTC model and Alibaba's BTB model, circular business model is expected to become the fifth model of the Internet. Experts call it CAE mode, which is bound to attract extensive attention from the international internet community, and experts also call it "the seventh wave of wealth".