Abstract: A new type of damped controllable magnetic fluid sliding bearing is designed. In order to explore the relationship between the applied current and the magnetic induction intensity in the working area, and to verify the rationality of the magnetic circuit design of the bearing, The magnetic field model of magnetic fluid plain bearing is analyzed by using finite element analysis software ANSYS, and the magnetic field test system of magnetic field generator is built. The experimental results are compared and analyzed. The results show that the magnetic induction intensity B in the working area is proportional to the applied current intensity I. The magnetic field distribution of the bearing is uniform and almost all the magnetic force lines pass through the working clearance of the magnetic fluid. The experimental results are in good agreement with the simulation results, so the magnetic circuit design of the sliding bearing designed in this paper is reasonable.