The invention discloses a commercial residential building online contract-signing system used for development enterprise terminal, comprising a user login module which is used for verifying the user identity and logging in the system, a main practitioner information module which is divided into an enterprise information unit and a project cost information unit, a commercial residential building presale module which is divided into a sale scheme back up application unit and a commercial residential building presale license application unit, a contract management module which is divided into a contract template unit, a commercial residential building sale contract unit, a supplement contract back-up application unit, a contract back-up information logoff application unit, and a contract final total price entering and other contract back up unit, a housing register management module which is divided into a pre-purchase commercial residential building advance-notice registration and a commercial residential building transaction application unit, a file information module which is divided into a building table unit, a commercial residential building pre-sale permit unit and a contract back up information unit, and a system tool module which is divided into a user management unit, a download special zone unit and a password correction unit. The statistic system of the invention is advanced, practical, strict, and stable, solves the problem that the data connection between the development enterprise and the department of housing management is difficult and improves the service quality and efficiency.