Abstract: According to the daily precipitation and air temperature data from five typical meteorological stations from 1961 to 2009 along the Liaohe River areas, the changes in the precipitation trends and air temperature were analyzed with a Mann-Kendall method. The relationship between the daily precipitation and runoff was discussed based on data from 162 precipitation days in summer at Tieling weather station and runoff data at Tieling hydrological station from 2006 to 2010. The results show that the mean annual precipitation tends to decrease, and the years with less precipitation significantly increase because summer precipitation that accounts for 65% of the total precipitation decreases with the rate of 7.4 mm/dec. The annual mean air temperature fluctuates and increases gradually. The ascending trend is significant, especially in winter, then in spring, while it is in a decreasing trend in summer. The change in precipitation trend is small in autumn. The daily precipitation is in a positive correlation with the daily runoff, especially with runoff on the next day after the rainfall.

Key words: The Liaohe River Basin, Precipitation, Runoff, Historical evolution characteristics