20 mm increased significantly(S<0.05)in their annual total amounts and days.The maximum daily precipitation also increased significantly.Both the maximum dry spell and the total dry spell of more than ten days had a significant upward trend.Since the beginning of the 1960s,all the extremely high,extremely low and mean temperatures increased signifi-cantly(S<0.01),at a rate of 0.1℃/10a,0.2℃/10a,and 0.2℃/10a,respectively.The days with extremely high temperature had a significant upward trend,while the days with extremely low temperature had a significant downward trend.The Qinghai Lake was significantly shrinking(S<0.01)and provided abundant sediments for Aeolian erosion.The NNW wind prevailed in the watershed,and the largest scale wind was from the west and concentrated on the dry months.As a result,the sandy land was mainly born on the east bank of Qinghai Lake.The total sandy land area in the watershed had grown from 587.4 km^(2),660.7 km,697.6 km^(2) to.805.8 km^(2),accordingly,its area percentage growing from 2.0%,2.2%,2.4% to 2.7%,respectively.