Abstract: Under different temperature and densities,the soil-water characteristic curves of unsaturated loess were deterrined by centrifuge tests.It was shown that the matrix suction decreased with the increase of the water content and density.The relationship among temperature,density,matrix suction and water content was exponential.A mathematical model of soil-water characteristic curve was derived.So the water content of unsaturated loess was computed under different temperature,densities and matrix suctions.