Abstract: The current drought and soil moisture content evaluation all using field capacity for available soil water cap classification evaluation, this method can not reflect low relative humidity of soil in different area differences. The paper based on soil water physical properties of automatic meteorological soil water station, put forward the new soil moisture level, through making full use of the site information provide more specific and accurate evaluation criteria, which avoided the soil sampling random error. It was important for automatic soil moisture station applied to regional drought monitoring and evaluation.