Effective monitoring of operational state of direct current cabinet is key to ensure safe and reliable operation of substation. By analyzing Modbus and IEC 61850 model, this paper proposes a kind of model mapping method. On the basis of analysis on function of the direct current cabinet, it states modeling process and introduces establishment of information model in accordance with IEC 61850 in order to realize mapping of Modbus agreement on IEC 61850. The designed direct current cabinet monitoring system is succes...