Abstract: Based on in-situ observation,mineral evolution in high-phosphorous iron ore during the reduction process was investigated in the H₂ atmosphere at different temperatures,and the influence of temperature on the morphology of iron was discussed. During the reduction process,ooliths in the iron ore remain. The mineral phases evolve faster with rising temperature,and so does the precipitation of iron from hematite phase. Significant segregation of iron happens at a higher temperature. Temperature has significant impact on the precipitation morphology of metallic iron. At 700℃,the precipitation of metallic iron forms a dense layer on the surface of particles. At 800℃,the precipitation morphology of metallic iron is complex,the density of the iron layer decreases,little holes appear while a small number of short iron whiskers are found. But at 900℃,the number of iron whiskers significantly increases with abundant porous sponge iron. Therefore,by adjusting the temperature and time,the sticking problem during the gas-based reduction process can be avoided,and meanwhile,efficient reduction of high phosphate iron ore is achieved.