Significant creep deformation occurs in steel subjected to elevated temperatures and loading, and thus affects the deformation and load capacity of steel Structures in fire. Currently there are many creep models, which are not widely suitable. Significant effect on fire resistance analysis of steel beam can be observed using different creep models. In order to quantity this effect, comparison was made to analyze five kinds of creep model. Fire resistance of restrained beam under five creep models was analyzed using computer program and the results were compared with test data. Norton creep model revealed best agreement with test data. Finally, parametric study was conducted on the parameters affecting the fire resistance of restrained steel beams. It is showed that Harmathy creep model had a greatest effect on fire response of restrained steel beams. The degree of creep influence to fire resistance of restrained steel beams for different creep models under different load ratio and restraint were different.