Abstract: By using the soil moisture data at fix observing section in Liaocheng City from 1996 to 2006,the soil moisture annual variation was analyzed by the method of statistic chart.The results showed that the soil moisture change trends in every lever of 0-50cm were basically consistent,appearing equally for V type,and the valley floor appeared before or after the first ten-day period in June,while wave crest appeared before or after October.The results could give certain reference to reasonable arrangement of local agricultural water,saving water resources and improving water use efficiency.

Key words: Liaocheng, Soil moisture, Spatial-temporal distribution, Changes