Lubricant viscosity is high crucial influence for the squeeze film pressure and load-carring capacity. Therefore, it becomes the important parameter in analysis of bearing performance study. The temperature is primary dominant factor to the variation of lubricant viscosity. In this research, we prove the characteristic of viscosity of uncompressible lubricant under plate lubricated with ferrofluid as viscosity varied with temperature. And viscosity (μ=μ₀exp (-γT)), γ is thermal co efficiency.The analytical result show that rise length with width, aspect ratio (β), and Hartmann number (Mo), will increase dimensionless squeeze film pressure (p*) and load-carrying capacity (W*). Furthermore, the longer response time (t*) can promote loading of the bearing. However, the larger γ or average temperature T of the lubricant film, the smaller squeeze film pressure (p*), and load-carrying capacity (W*). But, shorter response time t* will degrade the ability of bearing performance.