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The coke reduction gasification dephosphorization experiments were conducted on converter slag with FeO contents of 15 %, 20 %, 30 % and 35 %, respectively. Thermodynamic calculations , Scanning Electron Eicroscope (SEM) and Energy Dispersive Spectrometer (EDS) showed that the actual reduction Gibbs free energy of P₂O₅ was less than that of FeO for the coke reduction converter slag product of P₂, and the reactive driving force of P₂O₅ was greater under high FeO conditions. With the increase of FeO content, the gasification dephosphorization rate showed a trend of increasing first and then decreasing. After gasification dephosphorization, the presence of the Fe phase will adsorb more P elements, so the high FeO content is beneficial to increase the P₂O₅ activity, which is conducive to the gasification dephosphorization reaction.