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Abstract: On the base of surveying and analyzing soil water physical characteristics of 5 main soil types of water conservation forest and grassland in Qilian Mountains, the water-holding capability and infiltration rate of soil layer were measured. Meanwhile, the water content loss equation and water potential equation were modeled too. It indicated: forest soil had low bulk weight which were all less than 1 g ?cm-3 , with high infiltration rate and high water-holding capability, although there existed marked difference among them which could be ranked in the order of moss-Picea crassifolia, sub-alpine shrubs, shrub-Picea crassifolia, mid-low-mountain shrubs, Sabina przewalskii and grassland. The water-holding capability of Grey-drab forest soil was higher than that of Castanozem grassland soil in the same environment condition (water loss for e-vaporation) , the water loss curve of the former shaped in protruding and the latter was reversely, but the availability of soil water of the latter was higher while there were same water content level, and that played a more significant role to the life of forest especially in water deficient period.
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