Utilizing the daily precipitation data of 104 stations in the west part of Northwestern China(W-NWC) from May to October during 1961 to 2007, the temporal and spatial distribution and change tendency of intense rainfall during summer half year of nearly 47 years are analyzed. The results show that: (1) Intense rainfall frequency is more in the east of W-NWC than that in the west. The most intense rainfall days occurs in the east of Qinghai plateau which belongs to sub-humid areas, and the second one occurs in Tianshan Mountains and Qilian Mountains which belongs to semiarid region, and it rarely occurs and even has never occurred in the arid and extreme arid regions including the edge of South and North Xinjiang Basin and the west of Qaidam Basin. （2） It seems to be easier for maximum precipitation to appear in the west of W-NWC where is more arid than Qinghai Plateau, especially in Balguntay, Urumqi, Akqi, Charkhlik and Alxa Left Banner. (3) The earliest date occurred intense rainfall day presents that it is earlier in the east of W-NWC and the west and later in the middle, while the latest one is opposite. (4) Intense rainfall frequency in this region (especially Tianshan Mountains) has a growing trend, but increasing intensity is not obvious.