The reasons for the agglomeration of the compounding agent are: insufficient mastication of raw rubber, excessive roll spacing, high roll temperature, excessive rubber filling capacity, coarse particles or agglomerates, gel, etc. in the powder compounding agent. The improvement method is to take according to the specific situation: fully plasticize, adjust the roller distance appropriately, reduce the roller temperature, pay attention to the feeding method; dry and screen the powder; cut properly when mixing.