Danjiangkou Reservoir is the water source area of the Central Route of the South-North Water Transfer Project. Thus, its water quality is of great significance to the project. With the advantage of different water quality having different spectral characteristics, remote sensing technology was used to implement a wide-ranging, accurate and rapid monitoring of the water quality. In this study, four HJ-1A/B remote sensing images of the Danjiangkou Reservoir in March and July, 2011, and in March and September, 2013 were collected . Combined with the in situ water quality data, empirical models were applied to analyze three water quality variables quantitatively, including the Chlorophyll a (Chl-a) concentration, total Suspended Sediment (TSS) concentration, and water transparency (SD). The results showed that affected by major drought in the middle and lower reaches of the Yangtze River area, 2011 the Han River flow was small , resulting in a decrease of the water area of Danjiangkou Reservoir. During the same year, the Chl-a concentration during dry seasons was higher than that during wet seasons. While the Chl-a concentration in 2013 increased slightly, the retrieval results of TSS concentration indicated that higher water flow and stronger disturbance in the mouth area resulted in higher TSS concentration in the mouth area of Dan River and Han River than other areas. Then,that caused a lower the water transparency in the mouth area than other areas. Because of large water area of Dan River being in favor of depositing the suspended solids, the SD in Dan River was higher than that in Han River.%丹江口水库作为南水北调中线工程的水源地，其水质安全将直接影响到调水工程的成败。利用不同水质具有不同光谱特征的特点，采用遥感技术对水域水质进行大范围、准确、快速监测。根据丹江口库区2011年3月、7月、2013年3月、9月4景HJ1A/B卫星遥感影像，结合同步的地面实测水质数据，采用经验反演模型对丹江口水库叶绿素a浓度、水体悬浮物浓度和水体透明度进行了定量遥感反演研究。结果显示，由于2011年受到长江中下游区域重大旱情影响，汉江入库流量较小，造成丹江口水域面积减少；同年相比，水体叶绿素a浓度枯水期比丰水期高；2013年相比2011年水体叶绿素a浓度略有上升；丹库、汉库入库口的水体悬浮物浓度要高于其他区域，主要由于入库口的水流量较大，水体扰动较强。入库口区域较高的悬浮物浓度造成水体透明度要低于其他区域，丹库水域面积大，有利于悬浮物沉积，因此丹库水体透明度高于汉库。
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