In response to the problem that w(SiO₂) is generally high in magnetic powder for pelletizing in China, the suitable ore proportioning structure of two high-Si magnetic powders of Anqian mine and Daqiu mine is researched, by conducting pellet preparation tests on two high-Si magnetic powers at Dagoushan pelletizing Plant, and the 7% w(SiO₂) of the high-Si magnetite pellet thermal regulation is optimized. The results show that the compressive strength of fresh pellet does not change much with the increase of moisture when the ratio of magnetic powders of Anqian mine and Daqiu mine is 3:7, and the falling strength increases gradually, and the best performance of fresh pellet is achieved when the moisture content is (9.5±0.5)%, and the bursting temperatures are all greater than 700 ℃. Under the same ore powder ratio, the compressive strength of pellet gradually increases with the increase of preheat roasting temperature, the preheat ball strength exceeds 400 N/P when the preheat temperature is 1100℃, and the roasted ball strength exceeds 2500 N/P when the roasting temperature is 1250℃.