Abstract: Taking the converter-refining procedure of a steel plant as an example,symbol exergy-economic model was established by the exergy-economic analysis method. Then the cost balance equation was constructed,and supplementary equations were established. The unit exergy price and thermal-economic cost of each exergy flow in the procedure were obtained on the converter-refining procedure through thermal-economic analysis. The results show that the thermoeconomic cost of per ton molten steel in the converterladle refine process is the lowest,which is 2243.12 RMB. The thermoeconomic cost of per ton molten steel in the converter-CAS refining process comes second,which is 2259.92 RMB. And the converter-RH refining process has the highest thermal-economic cost of per ton molten steel,which is 2270.16 RMB. From the standpoint of energy conservation and cost reduction,the converter-refining process is the reasonable process for SPHC steel production.