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In this paper,based on in-situ observational data of the Coordinated Enhanced Observing Period (CEOP) Asia-Australia Monsoon Project (CAMP) on the Tibetan Plateau (CAMP-Tibet),structure of the Atmospheric Boundary Layer (ABL) was preliminarily studied during the dry and rainy seasons.The main results show:(a) Diurnal variation of the ABL is obvious over the northern Tibetan Plateau area.The height of the ABL is different with the season change,which ranges from 2,211 m to 4,430 m during the pre-monsoon season and from 1,006 m to 2,212 m during the monsoon season.The ABL height is higher during the dry period than during the rainy period.(b) The humidity is lower during the dry period than during the rainy period,and there are reverse humidity during both periods.(c) Horizontal wind direction is mostly west during the dry period,east under the height of 2,500 m and west above the height of 2,500 m during the rainy period.The wind speed is low during both the rainy and dry periods in the lower ABL layer.The wind speed is stronger within the upper ABL during the dry period than during the rainy period.