This text discusses the current water environment of Zhangye in the middle reaches of Heihe River and the ecological influence to the Egina oasis in low reaches emphatically, and puts forward the corresponding countermeasures.

• 本文著重论述了黑河中游张掖市水环境的现状及其对下游额济纳绿洲生态的影响，并提出了相应的对策。