本論文利用光達(Lidar – Light Detection and Ranging)的技術，測量2002年8月到2003年1月間，10公里以下背景氣膠的背向散射比(Backscattering Ratio)、光學厚度與雲的分佈。10公里以下的氣膠背向散射比，在6 到8.5公里之間幾乎是定值，值約1.05；而10公里以下雲的分佈，主要分佈在3~4公里與8~9公里之間。另外，我們分析了1999年11月到2001年4月間所量測之5到10公里背景氣膠的消偏振率(Depolarization Ratio)，其中春季為0.033，夏季為0.027，秋季為0.019，冬季為0.023。最後本論文介紹了以訊號分類的方式，討論本實驗室參與環保署2002年、2003年春季沙塵暴量測計畫的觀測結果。 In this thesis, we showed the aerosol backscattering ratio, optical depth and the cloud distributions of the atmosphere below 10 km between August 2002 and January 2003 measured by NCU lidar system at ChungLi. The backscattering ratios of aerosol between 6 and 8.5 km were almost a constant about 1.05. The clouds lowered than 10 km were mainly distributed over 3 to 4 km and 8 to 9 km. The measurements of aerosol depolarization ratio between 5 and 10 km covering the period from November 1999 to April 2001 were analyzed and compared with humidity profiles obtained by CWB radiosonde datum. The average depolarization ratio at spring, summer, fall, and winter were 0.033, 0.027, 0.019, and 0.023 respectively. The results of the lidar measurements during the 2002 and 2003 Asia dust events were also presented.