In this paper, the technology of the computational fluid dynamics coupling discrete element method, enhanced with in-house subroutines was applied to study the deposition behaviour of micro-particles. We use a particle interaction model to simulate the particle deposition behaviour on the surface of the elliptical fibre. The model well predicts the formation of the dendrites and the dynamic progression of the deposition. The deposition structure and the collection efficiency with different angles of orientation relative to the incoming flow, particle diameters, inlet fluid velocity and fibre diameters were explored. For the smaller-size particles which are mainly dominated by the diffusion, the different angles of orientation relative to the incoming flow increases have little influence. It is more obvious on larger particle diameter. There is the higher collection efficiency for relative smaller fluid velocity and bigger particle diameter. The normalized pressure drop and the velocity gradient on both sides of the fibre increase as SVF increases. The collection efficiency increases gradually as SVF increases.