Abstract: In order to reduce the fluctuation of grinding powder particle size of graphite raw materials and improve the recovery rate of fine powder，the response surface test is carried out.The results show that the classification frequency，the main machine frequency，the interaction of main machine classification and the interaction of feeding main machine have a significant effect on the fine powder particle size d50 of raw material grinding powder，and the degree of influence decreases in turn. The degree of influence on the recovery rate is the main machine frequency > classification frequency > induced draft frequency，and the interaction between the factors is weak.The optimized process conditions are as follows that feeding fre‐ quency is 9 Hz，main machine frequency is 19.7 Hz，classification frequency is 10.5 Hz，and induced draft frequency is 25 Hz. Under these conditions，the d50 of fine powder particle size is 24.90 μm，and the recovery rate is 88.13%. The predicted value is close to the experimental value，and the regression model had good fitting degree and reliability.

Key words: raw material grinding powder, fine powder particle size, fine powder recovery rate, re‐ sponse surface test, interaction