[Objective] To investigate the variations and relationships of temperature

precipitation and runoff during 1970-2016

in order to explore the impacts of climate change on precipitation and runoff and simulate the evolution of runoff in Qingyuan River

the source region of the Weihe River.[Methods] The inter-annual variations and the relationships between climatic elements and runoff were analyzed. Three temperature modified climate-hydrological models and general hydrological models were compared to explore the impacts of climate change on runoff.[Results] The period from 1994 to 1995 was the dividing line of the main meteorological and hydrological elements in Qingyuan River basin. During 1970-1994

there was no significant variation in the annual average temperature

precipitation and runoff. However

temperature showed an increasing trend while precipitation and runoff showed a decreasing trend after 1995. Compared to the period of 1970-1974

the annual average temperature increased by 0.9℃ in 2010-2016 (with a rate of 15.79%)

while the annual precipitation and runoff decreased by 13.48% and 31.82%

respectively. The three climate-hydrological models

MQPT1-1

MQPT2-1 and MQPT3-1

showed higher accuracies than the general hydrological model by simulating the annual precipitation and runoff processes. Especially

the mean simulated error of MQPT2-1 (modified model based on air temperature disturbance) was only 3.03%

which was 11.62% higher than the general hydrological model (without considering climate change).[Conclusion] Temperature variation had significant impacts on runoff in the last 50 years in the Qingyuan River basin

especially after 1995. In addition

the impacts of temperature and other major meteorological factors should be involved in runoff simulation analysis.