Zhang et al. (Water Resour Manag doi:10.1007/s11269-012-0182-2, 2012) studied the impacts of climate change and human activities on the runoff for the Huifa River basin. They employed a soil and water assessment tool (SWAT), which was calibrated for the baseline period 1956-1964, and then used to reconstruct the natural runoff for the climate change period 1965-2000. Results showed that both climate change and human activities decrease the observed runoff. Climate change impacts on annual runoff were -37. 7, -59. 5, +36. 9, and -45. 2 mm/a for 1965-1975, 1976-1985, 1986-1995, and 1996-2005 respectively, compared with the baseline period 1956-1964. Human activities decreased runoff and caused a relatively larger magnitude impact than those of climate change after 1985. Human activities decreased the annual runoff by -32. 9, -46. 8, -67. 8, and -54. 9 mm/a for 1965-1975, 1976-1985, 1986-1995, and 1996-2005 respectively. Human activities further decreased runoff in wet years due to regulation and storage of water projects.