The spectral measurments of ground-cover before the flight with an airborne multispectral scanner in Chaidam Basin, Qinghai Province are represented in this paper, in order to provide the basis for selection of best spectral bands of ground-cover identification. The spectral data over 190 samples to be taken in site, such as water, soil, vagetation, rock and salt ect, has been obtained in 1986. The optimun bands for exploration of potass resources have been selected according to the ten spectral bands in the DS-1260 scanner arranging from visible to near-infrared spectrum, with the help of the T-test and sequence-test methods in statistics.