Online fishery market (OFM) is a fishery e-business platform that can meet dual need both on urban fishery and fishery e-business development. Firstly, OFM can promote the scientific lever of fishery industry and improve the linkage between tangible market and virtual ones in order to form a great market & great circulation structure. Secondly, OFM can decrease the waste of land resources caused by many tangible markets and reduce environmental pollution of noise, sewage & feculence. Thirdly, OFM can transact business among transnational or trans-regional parties unrestricted by time or trading area so as to enhance the competitive ability of fishery industry in the international trade. In order to reach synchronously many various business modes such as spot stock, online auction and reverse auction, an OFM must have seafood trading system, a discussion area for trading and one service area for the market. There are two important elements in OFM operation which are rating of seafood and credit guarantee in trading. The establishing risks of OFM construction come from system, environment and market.