Abstract: A newly developed electromagnetic device was introduced. The device had the magnetic poles protruded forward and was suitable to installing the image fiber for the ferrographic analysis of wear debris. The magnetic flux intensity and diversity along the oil flow direction were simulated making use of finite element software Ansys, and the parameters applicable to the electromagnet were suggested. It was found that the theoretical results based on the finite element analysis agreed well with the corresponding experimental ones. Thus it was feasible to use the designed electromagnet to collecte the deposited wear particles.