本模型以降水、蒸发为输入，以土壤缺水量Ｐｓ为输出，Ｐｓ可较清楚地表述干旱。该模型可用于湿润地区及干旱、半干旱地区。模型已在安徽省试运行，从逐日Ｐｓ等值线图看，可较好地反映干旱的地区分布及旱情的发展过程。并运用历史资料分析了 ４个代表站的３１年逐日 Ｐｓ值，与安徽历史旱情基本吻合。 The model takes precipitation and evaporation as input, soil water shortage Ps as output, and Ps can describe drought more clearly. The model can be used in humid areas and arid and semi-arid areas. The model has been put into trial operation in Anhui Province. From the day-to-day Ps contour map, the model can well reflect the regional distribution of drought and the development of drought. By using the historical data, the 31-year daily Ps values ​​of four representative stations were analyzed, which are consistent with the historical drought in Anhui Province.