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When magnetic fluid lays in the magnetic field, there is interaction between magnetic fluid and magnetic field.Due to the existence of coupling between magnetic fluid and magnetic field, it is difficult to compute precisely.The decoupled computations are the precise method of analyzing the characteristic of magnetic fluid in the magnetic fluid.The more is error between decoupled computations and linear computations, the more is saturation magnetization on the border.The value of magnetic flux density used in decoupled computations is larger than the linear computations.The equal magnetic flux density linear on the border varies small in the stronger magnetic field between the decoupled computations and the linear computations.The equal magnetic flux density linear on the border varies big in the weak magnetic field between the decoupled computations and the linear computations.