With the magnetic suspension as the main method and hydrostatic bearing as the secondary one, the bearing capacity and stiffness can be improved substantially. MagneticLiquid Double Suspension Bearing (MLDSB) is suitable for the occasions of mediumspeed overload, and has high stability and long service life. Due to small film thickness, strong damping, positive stiffness and repulsion of hydrostatic bearing system, and large air gap, weak damping, negative stiffness and suction of magnetic suspension system, the operation stability of MLDSB can be reduced sharply by the coupling and the interference between two bearing system. In this paper, the MagneticLiquid coupling characteristic of single DOF bearing system is analyzed, the produce mechanism of coupling force is revealed, and then the decoupling controller can be designed. Firstly, the structure of MLDSB, the mechanical behavior and the adjusting principle of single DOF bearing system are presented. Then, the mathematical model of single DOF bearing system is established, and the coupling characteristic and influence law between MagneticLiquid bearing systems can be revealed. Finally, Similar FeedForward Decoupling Controller and DiagonalMatrix Decoupling Controller are designed, and the decoupling effect of two controller with Simulink modules can be contrasted and analyzed. The results show that two decoupling controllers can reduce the coupling degree between MagneticLiquid bearing systems, but Similar FeedForward Decoupling Controller is more suitable for the decoupling controller of MLDSB with the high operation stability and the accuracy. The research in the paper can provide the theoretical reference for the stable control of MLDSB.