Abstract: The Lithium battery electrode slitting machine is usually equipped with corresponding dust removal equipment to remove small particles that are generated during the slitting process, so that the cleanliness of the productive environment and the battery quality can be ensured. Nowadays, there are two different kinds of dust removal mechanisms, rotating brushes and air exhauster, and their performance can be checked by coupling CFD(Computational Fluid Dynamics) and DPM(Discrete Particle Method) in Fluent. According to the simulation results, the design can be optimized and the trail-and-error cost can be reduced. In the current Fluent model, the attraction force between walls and particles is ignored, thus the dust removal rate of a dust removal equipment is overestimated(around 99.9%) for small particles, which is contradictory to the phenomenon that there are particles sticking on the walls. Hence, the wall boundary conditions of the particles in Fluent are redefined by using the UDF(user-defined functions) to generate the adsorption effect of the wall facing the particles. With this improvement, the particle can be trapped by walls based on its velocity, and the dust removal rate for particles with diameters less than 10 decreased dramatically, from 99.9% to 68.5%, which is more reliable and closer to the phenomenon observed in the real production process.