介绍了一台新型偏振－米散射激光雷达用于探测大气气溶胶和卷云的消光特性及偏振特性。为了验证激光雷达探测性能可靠性，采用了3种方法：一是对偏振－米散射激光雷达主要性能参量指标的测定；二是偏振－米散射激光雷达与同类激光雷达对比实验；三是偏振－米散射激光雷达与太阳辐射计探测光学厚度对比实验。实验验证了该系统性能稳定，对比实验探测结果基本一致，探测数据可靠。2007－02～2007－05，利用偏振－米散射激光雷达取得了合肥地区卷云退偏振比的观测结果。结果表明，卷云的退偏振比随高度增加而呈现上升趋势，在7km～12km高度范围内，退偏比在0．2～0．5之间，其平均值为0．36±0．06。

A new polarization-Mie lidar(PML)used for detecting extinction and polarization characteristic of aerosol and cirrus is described. Three methods for validate reliability of PML are presented. Firstly,the main performance parameters of PML itself are determined. Secondly,the comparison experiments between PML and homogeneous lidar are completed. Finally,aerosol optical depth compared between PML and solar radiometer are finished. The validation results show that PML is steady and reliable. The detected results of depolarization ratio for cirrus over Hefei from February to May in 2007 are also presented and discussed. The cirrus is generally present in the altitude from 7km to 12km,and the depolarization ratio varies from 0.2 to 0.5 with average 0.36±0.06.At the meanwhile,depolarization ratio appears a climbing tendency with the increased height.