根据2009年8月22-24日实测的三峡水库水体的光谱数据以及水质参数, 对三峡水库漫衰减系数的光学特性及影响因子进行分析研究, 构建了490nm处漫衰减系数的K<sub>d</sub>(490)反演模型, 并利用环境一号卫星CCD数据对2009年7月21日的三峡水库K<sub>d</sub>(490)进行反演.结果表明:由于水体中非色素颗粒物的含量较高, 使得研究区大部分点位的K<sub>d</sub>值在440nm和675nm处的衰减峰值不明显, 对K<sub>d</sub>占主导地位的影响因子是颗粒物的吸收作用以及水体的总散射作用, 在所选的四个特征波段(440、550、613和675nm)处, 其贡献率的均值分别为45.48%和38.21%;在400-700nm波段范围, K<sub>d</sub>与非色素颗粒物浓度具有很好的幂函数关系.利用地面实测遥感反射率模拟环境卫星第三波段构建K<sub>d</sub>(490)反演模型, 其平均相对误差为17.89%, 直接利用卫星数据反演的相对误差为28.38%;研究区中K<sub>d</sub>(490)主要集中在6-7m<sup>-1</sup>, 占研究区域面积的83.60%, 相比而言, 入库支流的K<sub>d</sub>(490)较干流要低, 表明支流颗粒物含量相对较低。;By using the in situ measured data of spectral reflectance and water quality parameters in Aug.22-24, 2009, this study analyzed the spectral characteristics and affecting factors of diffuse attenuation coefficient(K<sub>d</sub>) of the Three Gorges Reservoir, and built a retrieving model of K<sub>d</sub>(490)at band 490nm.In addition, K<sub>d</sub>(490)was inversed by using CCD image of HJ-1 satellite in July 21, 2009.The results showed that the attenuation peaks were not distinct at bands 440nm and 675nm owing to the high content of non-pigment particulates in the water.The dominant affecting factors were absorption of particulates and total scattering water body, while average contributions of the four bands(i.e.440, 550, 613 and 675nm) were 45.48% and 38.21%, respectively;K<sub>d</sub> strongly power correlated with the concentration of non-pigment particles between 400 to 700nm.Besides, the average relative error of inversed vs.measured K<sub>d</sub>(490) was 17.89% for ground-measured R<sub>ts</sub>, whereas the relative error for images data was 28.38%;K<sub>d</sub>(490)of the study area was concentrated from 6 to 7m<sup>-1</sup>, which accounted for 83.60% of the study area.Additionally, K<sub>d</sub>(490)of the tributaries of the reservoir was lower than the main stream, which indicated that the content of particulates in tributaries was relatively low.