As a core process for energy consumption and carbon emissions in the iron and steel industry,blast furnace ironmaking is highly dependenton the precise matching between the metallurgical properties of the furnace charge and the reducing atmosphere for its efficient and low-carbon operation.The gasutilization rateis akey indicator for evaluating the neaas furnace charge. Through systematic experiments,this study reveals the regulatory laws of changes in gas utilization rate on the low-temperature reduction degradation index （RDI) and reduction index （RI) of sinter and pelets. The results show that with the increase ingasutilization rate,the RDIof sinter generally increases,whilethe RI of the furnace burdens shows an increasing trend, and this effect law is adjusted and controlled by the furnace burden composition. Among the sinters,S-C exhibits the optimal anti-degradation performance due to its high basicity that promotes the formation of calcium ferite;S-Amaintains stablemetallurgical propertiesas MgO forms magnesium ferrite to inhibitexpansion;while S-B shows the highest degree of degradation due to low SiO₂ content leading to increased skeletal hematite. In terms of reducibility S-B achieves the highest RI among the three groups of sinter due to its low silicate content,while pellet P-C reaches an RI of 85.75% owing to its high TFe and low gangue phase content XRD and SEM-EDS analyses confirm that the decrease in gas utilization rate intensifies the phase transformation stress from Fe₂ O₃ ,to Fe₃ O₄ ,resulting in the increasing of microcracksand pores.This study analyzes theeffect law of gasutilizationrate on the metallurgical properties of the furnace charge,providing a theoretical basis for the low-carbon operation of blast furnaces and the optimization of furnace charge structure.