Abstract: Based on the computational fluid dynamics method, a new 5000 t/d dry process cement production line in China was selected as the research object, and the factors affecting the combustion efficiency of refuse-derived fuel （RDF） were explored on the basis of obtaining the internal thermal state law of the calciner. The effects of different RDF feeding amounts, feeding positions, hydrogen doping amounts and other factors on the combustion characteristics of fuel were simulated and studied. The results show that: ① The RDF disposal amount increases from 8% to 16%, and the overall RDF burndown rate decreases from 80.95% to 63.02%, which causes the outlet temperature of the calciner to decrease and affects the stability of the kiln system. ② The RDF feeding position was adjusted from the middle of the calciner column to the bottom, and the overall burndown rate of RDF increased from 63.02% to 64.82%, the increase was not obvious, and the feeding position had little effect on the RDF burnout rate. ③ The addition of a certain proportion of hydrogen in the calciner has little effect on the burnout rate of RDF, but it has a certain catalytic effect on the combustion of RDF, the combustion peak is advanced, and the combustion distance is shortened. ④ Hydrogen blending can improve the combustion state, temperature peak and temperature distribution of the fuel, the temperature gradient in the furnace becomes smaller, the average temperature decreases, and the temperature distribution is more uniform.