Based on the data of Lanzhou meteorological observation from 1971 to 2000 and the data from 2001 to 2004,the temporal characteristics and the cause of sand and dust weather in Lanzhou city are analyzed.

• 利用1971~2000年和2001~2004年兰州市观测站资料,分析了兰州市沙尘天气的气候特征和2001~2004年沙尘天气特点及产生原因。