Abstract: On the basis of studies on material flow and energy flow balances in ferronickel smelting,the utilization rate and heat loss of every process were obtained,and the reaction rates of ores,reductants and fluxes were calculated in each part of the ferronickel smelting process. The effect of nickel content in the nickel laterite ore and ferronickel alloy on the contents of nickel and iron in the slag was analyzed. Computational models of overall material flow and energy flow were built. In addition to the function of calculating overall material flow and energy flow in the system,the computational models also have the function of coordinating material flow and energy flow among subsystems. Based on the relevance of material flow and energy flow in each subsystem,the utilization rate and heat loss of flue gas and furnace gas were calculated,and the calculation software of the overall ferronickel smelting process was developed by using Visual Basic.