Aiming at 4 cascade hydropower developing scheme of lower Jinsha River including Wudongde, Baihetan, Xiluodu and Xiangjiaba hydropower stations, the navigation channel conditions in fluctuating backwater area and perennial backwater area were studied. The results shows that the perennial backwater area with length of 617 km and fluctuating backwater area with length of 117 km were formed in the river channel with length of 768 km. Under normal water level, the navigation channel con-ditions were improved, which meets the requirement of 1000 DWT channel. Navigation is impossible when reservoir water level drops to dead storage level. After the completion of the reservoirs, river channel regulation and geological hazard treatment in the reservoir region needs to be carried out, so as to ensure the navigation safety.%针对金沙江下游河段乌东德-白鹤滩-溪洛渡-向家坝4级开发方案，对常年回水区和变动回水区的航道条件进行了研究。结果表明：梯级电站建成后，可在768 km的河段上形成总长约617 km的常年回水区和总长约117 km的变动回水区，在水库维持正常蓄水位运行时，河道航道条件将有所改善，均基本符合1000 t级航道要求；当水库水位消落至死水位附近时，不能满足通航要求；水库建成后，需整治河道和治理库区地质灾害，以保障通航安全。
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