Abstract: The spatiotemporal distribution of blue and green water resources in Xi River Basin from 1977 to 2015 are simulated using the Soil and Water Assessment Tool (SWAT) model and the SUFI-2 algorithm. The results show that (1) The average water resources in Xi River Basin are 953.24 mm, of which the blue water resources are 290.9 mm and green water resource are 662.33 mm. Water resources of Xi River Basin are mainly green water. (2) Blue water resources in Xi River Basin change greatly in typical years. Which are 86mm, 277mm and 656mm in dry years, normal year and wet years respectively. There are also differences in green water coefficient in typical years, which are 87.12%, 69.78% and 49.31% respectively. (3)Blue water resources in Xi River Basin shows a trend of decrease from east to west. While green water resources shows a trend of decrease from the edge to the center. The green water storage shows a trend of decrease from east to west, especially in dry years.