In order to utilize the steel slag reasonably, solve the environmental pollution problem and increase crop yield, the rice fertilizer containing silicon which was produced with slag silicon fertilizer, the secondary product produced in the process of molten steel by steel converter, as filling material, rice fertilizer containing silicon was  compared with the rice fertilizer made from sepiolite or medical stone. The results show that the rice production of rice fertilizer containing silicon produced with slag silicon fertilizer as filling material increased by more than 5%～10%.