为研究正交偏振云气溶胶激光雷达（CALIOP）最新Version 4（V4）版产品与Version 3（V3）版产品全球大气气溶胶和云衰减后向散射特征的差异及其对以往研究可能造成的影响，利用2011年1、4、7、10月CALIOP 这两个版本的数据，对20.2 km海拔高度内全球范围云和气溶胶样本点的532 nm总衰减后向散射、1064 nm衰减后向散射、总衰减颜色比进行了概率分布统计,并对两个不同版本相应数据的相对偏差做出统计分析。结果表明，云或气溶胶V4版与V3版散射数据的相对偏差趋于正值，夜间数据的变化比日间数据明显。V4版与V3版云的日间532 nm总衰减后向散射、1064 nm衰减后向散射及总衰减颜色比的相对偏差均值分别为3.40%、4.66%和1.18%，而夜间的则分别为2.80%、8.00%和5.33%。气溶胶的532 nm总衰减后向散射、1064 nm衰减后向散射及总衰减颜色比的相对偏差均值日间分别为1.14%、6.94%和5.62%，夜间分别为3.33%、10.92%和7.64%。

In order to study the differences of attenuated backscatter characters of global clouds and aerosols obtained from the cloud-aerosol lidar with orthogonal polarization (CALIOP) the latest version of Version 4(V4) and Version 3(V3) products separately, and the potential impacts on previous studies. The CALIOP two vertical products in January, April, July and October of 2011 are used to gather probability distribution statistic of clouds or aerosols 532 nm total attenuated backscatters, 1064 nm attenuated backscatters and total attenuated color ratios respectively below the altitude of 20.2 km all over the world. And the relative deviation of two different versions of the corresponding data is made statistical analysis. The results show that the relative deviations of the attenuated backscatters between V4 and V3 products for clouds and aerosols tend to be positive values, and the changes from V3 to V4 data are more obvious at nighttime than those at daytime for both clouds and aerosols. The mean relative deviations from V4 and V3 of clouds daytime 532 nm total attenuated backscatters, 1064 nm attenuated backscatters and total attenuated color ratios are 3.40%, 4.66% and 1.18% separately, and those of clouds nighttime data are 2.80%,8.00% and 5.33% separately. The mean relative deviations of aerosols daytime 532 nm total attenuated backscatters, 1064 nm attenuated backscatters and total attenuated color ratios are 1.14%,6.94% and 5.62% separately, those of aerosols nighttime data are 3.33%, 10.92% and 7.64% separately.