Abstract: Based on the data of runoff volume in the Luanhe River Basin during the period of 1956-2008, the M-K test and power spectrum analysis were used to analyze the evolution of runoff volume in the Luanhe River Basin. Meteorological data observed by 9 meteorological stations during the period of 1957-2008 and the land use data during the period of 1985-2000 were used to identify the factors affecting the change of runoff volume. The results show that the runoff volume was holistically in a decrease trend, especially in the upper reaches. The decrease trend was more significant during the low-flow periods, which indicates that drought and flood may occur more frequently．The results also show that the runoff volume was sharply decreased in 1959 and 1996, increased in the late-1980s, and decreased again after 1998. There was a 16-year periodicity of runoff volume change in the Luanhe River Basin and a 64-year one in the upper reaches, and there were also the 9-10-year 2-3-year periodicities in the middle and lower reaches. The most important climate factors affecting runoff volume were precipitation and evaporation, and then land use cover change.

Key words: runoff volume, land use, affecting factor, M-K test, Luanhe River, Hebei Province