From October to November

IRSA of CAS in cooperation with Beijing Normal University Remote Sensing Center and some other research institutes carried out a Remote Sensing experiment in Qianyanzhou Region

Jiangxi Province. During the experiment period automatic sun tracking photometer CE318 produced by France CIMEL company was used to measure the sun direct irradiance

and a large amount of data was obtained.Based on these data

AOT（aerosol optical thickness） and Angstrom parameters were retrieved.Through analyzing the variation of AOT and Angstrom parameters

the reason which cause the variation was discussed.In this paper some factors which could introduce error into the retrieval result were also discussed.