Experimental research, thermodynamic and kinetic analysis were used to investigate the effect of H2 content in (H2-CO-N2) gas on H2-rich reduction behavior of iron ore sinter under the conditions of high pulverized coal injection rate and oxygen enrichment. The results showed that with H2 content in reducing gas increased from 0 to 10%, the reduction degree of sinter was increased by 15.3%, 11.5% and 11.4% at 700, 900 and 1000℃, respectively, the reduction rate not only increased, but also the ending time was greatly shortened with the increase of temperature. The transformation speed of Fe2O3 and FeO was faster when the content of H2 was 10% during the reduction process of sinter. The reduction of iron ore sinter was controlled by interfacial chemical reaction in the initial stage, and both interfacial chemical reaction and inner diffusion in the final stage.