The consistency is the basis for hydrological analysis, and consistency has been destroyed in changing environment. Most of the well-studied cases of abrupt changes pay close attention to precipitation or runoff. This study focuses on detecting changes in annual precipitation and runoff for the five states in Wei River Basin (WRB)of the Northeastern China. Using Mann-Kendall test，double mass curve,we analyze relationship of precipitation and runoff observations to detect WRB that have undergone decreases and abrupt changes in precipitation and runoff for each of the five stations for the time period, 1951 to 2010. To further validate variation of the relationship between precipitation and runoff, the Euclidean distance of copula function and experience copula function indicate the distribution type of precipitation and runoff has changed in the variation before and after.Our results show that in the past 60 years, precipitation and runoff have undergone variation in WRB, and a significant decreasing trend in runoff. The attribution of climate variability and human activities for runoff changes was quantitatively assessed in different station of the WRB.The results of the study will be beneficial to the regional water resources management in Wei River Basin under the changing environment.