In the traditional lending industry, due to the ubiquitous information asymmetry, borrowers can't find suitable funds quickly, and lenders with idle funds can't find trustworthy borrowers, which leads to the emergence of legal intermediaries such as banks, pawn shops and guarantee companies, and illegal intermediaries such as underground banks. Legal intermediaries have an advantage in interest rates, but small emergency loans for ordinary people are rarely involved because of their high cost; Illegal institutions have the advantage of easy and quick loan conditions, but the high interest rate has brought unbearable pain to ordinary people. With the modernization of information industry, the barrier of information asymmetry will be gradually broken, and a small P2P direct loan e-commerce platform like Chengyibao came into being.