Abstract: Cylindrical particles are common in nature and industrial process, and its movement in flow field is significantly different from that of spherical particles. In this paper, the direct forcing immersed boundary method was used to numerically simulate the motion of cylindrical particles in a linear shear flow. The flow field around the cylindrical particle is investigated in detail, and the moment acting on the particle is calculated. It reveals the rule of the moving particle caused by the interaction of the fluid drag force and the particle inertia force. Furthermore, the influence of the Reynolds number on the particle motion was also investigated.