For simplifying IO hard wiring distributing and designing operation in a DCS engineering application process, the invention discloses a DCS for forming IO hard wiring distribution based on software configuration, and a distribution method thereof. The DCS is advantageous in that a master control cabinet is independent from an IO cabinet; all IO functional modules are designed in a front insertionmanner; terminal boards in a terminal form are used for designing all IO hard wirings; a wiring code database is designed for the field signals of different wiring modes; selection of a wiring type code is required for the software configuration; a system automatically distribute terminal positions according to the software configuration information; and the system generates an IO hard wiring point table. The DCS and the distribution method thereof have advantages of simplifying IO hard wiring distributing and designing in the DCS engineering application process, ensuring consistency between software configuration definition and IO hard wiring distribution designing, and improving engineering designing efficiency.