In order to solve the problem of low metallization rate of pelletization in the rotary bottom furnace in industrial production，and explore the influencing factors and optimal parameters of direct reduction of zinc-containing dust pellets， the effects of different empty coal ratios，n（C） / n（O） （ ratio of substances），reduction temperature and furnace bottom speed on pelletization rate are analyzed by designing a five-factor five-level orthogonal test，the optimal reduction process parameters are obtained，and comparative verification tests of different amount of fresh pellets in the oven are proposed. The results show that the temperature of the second reduction zone and n（C） / n（O） of the rotary bottom furnace are significant factors affecting the direct reduction，and the influence on the reduction process is much greater than that of the empty coal ratio，the temperature of the first reduction zone and the speed of the rotary bottom furnace. In addition， the pellet metallization rate is closely related to the amount of fresh pellets in the furnace，and with the increase of the amount of fresh pellets in the furnace，the metallization rate of pellets gradually decreases. The production practice is carried out under the optimal reduction parameters of 2. 2 empty coal ratio，1. 4 n（C） / n（O），1 250 ℃ in the first zone，1 260 ℃ in the second zone，and 25 min in the rotary bottom speed of the furnace. Under the premise of meeting the design indicators，that is， when the amount of pellets entering the furnace is ≥26 t / h，the metallization rate of pellets is increased significantly，from 67. 10% in 2023 to 72. 16% in 2024. Under the premise of meeting the design indicators，that is，when the amount of fresh pellets in the furnace is ≥26 t / h，the metallization rate of pellets is increased significantly，from 67. 10% in 2023 to 72. 16% in 2024. The research results can provide a technical reference for improving the metallization rate of zinc- containing dust pellets in the production of rotary bottom furnaces.