The pilot study on soil moisture dynamic variation law in dry season ' s in the dry-hot valley areas has been done in order to develop the vegetation restoration experiment. The results show as follows: The soil moisture in dry seasons increases gradually with the increase of altitude. The soil moisture in dry seasons in different land use type areas at same altitude is lower and its quantities are all below 8%. The vertical changes of soil moisture content influenced by the distribution of rainfall infiltration and upward evaporation of soil moisture show rising with the elevation increase. The indexes of variation coefficient can be used to describe and analyse the soil vertical moisture variation.