Differences exist between the exchange market and the OTC market.To facilitate regulation and risk prevention, the advancement in science and technology is increasingly bringing the OTC business into the exchange market.However, not all OTC business is proper for floor trading, except the highly standardized.In formulating business rules, stock exchanges should take the positions of market players into account in their self-governance and measure the involvement in OTC business, in order to guard against business risks and ensure the interests of the investing public.