To recycle the phosphorus in P-bearing steelmaking slag and use the slag as phosphate fertilizer, it is necessary to study the distribution of P2O5 between the P-rich phase and matrix phase in P-bearing steelmaking slag. The addition of MgO and MnO into the slag has no effect on the phosphorus form of existence in the slag and has little effect on the %(P2O5)SS. In contrast, Na2O and CaF2 in the slag change the phosphorus form of existence in the slag and increase %(P2O5)SS obviously. Lp',

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... mma _{{{\rm{P}}_2}{{\rm{O}}_5}(SS)}}$, ${\gamma _{{{\rm{P}}_2}{{\rm{O}}_5}(M)}}$, CP(M) and CP(SS) were calculated, and it was found that %(CaO), %(T.Fe) and %(P2O5) in the P-rich phase and matrix phase significantly affect Lp'. MnO and MgO in the slag have little effect on the distribution of P2O5 between the P-rich phase and matrix phase, whereas Na2O and CaF2 affect the distribution of P2O5 between the P-rich phase and matrix phase.