Abstract: The carbon emissions from ironmaking process account for more than 70% of the steel industry. Driven by the "carbon peak" and "carbon neutrality", the hydrogen-enriched blast furnace（BF） has become a dominant research interest. Hydrogen or hydrogen-enriched gas is injected through the tuyere to replace partial carbon with hydrogen, so as to reduce carbon emissions. The one-dimensional kinetic model of hydrogen-enriched blast furnace was established based on the rate equations and control equations of blast furnace operation, and the effect of hydrogen injection on smelting behavior was simulated, while the industrial data of blast furnace were used to validate, and the influences of hydrogen injection rate on indirect reduction degree and the thermal reserve zone （TRZ） were investigated. It shows that with the increase of hydrogen injection rate, the average temperature in the TRZ increases from 1 052 K （without hydrogen injection） to 1 243 K （with hydrogen injection of 100 m³/t）. Meanwhile, the upper and lower boundaries of TRZ moves down by 0.1 m and 1.5 m, respectively. Totally, the height of TRZ increases 1.4 m. The overall indirect reduction degree in the blast furnace is improved from 60.68% to 70.65%. The calculation results from the one-dimensional kinetic model and the energy-material balance model are in good agreement with each other, increasing the amount of hydrogen injection is conducive to the indirect reduction. On the whole, the reduction rate accelerates, further reducing the carbon consumption of direct reduction in the high temperature region. The result has vital theoretical value for digitization of the low-carbon blast furnace, further promoting the low-carbon transformation of steel industry. With the breakthrough of hydrogen preparation technology and the optimization of injection parameters with digital model, hydrogen-enriched BF process is expected to become the core path in the period of transition to "hydrogen metallurgy".