An investigation was made on the relationship between the spectral reflectivity of different field soil humidities on yellow brown earth and the spectral reflectivity of ovendried soil samples using the data in the waveband of 410-1000 nm.Experimental results showed that this relationship followed the first order regression equation.Meanwhile, the relationship between soil spectral reflectivities at four wavelengths and soil hnmidities was also studied,and it was showed that the relationship followed the second order regcession equation.On the basis of the experiments their varying characteristics and the significance of its application in remote sensing are briefly discussed.