探讨了三峡船闸四级运行方式下二闸首作为首级运行时一闸室水体波动特性；阐述了波动形成的机理，分析了二闸首阀门运行方式对一闸室波动的影响；提出了满足一闸室待闸安全要求的阀门开启方式；通过实船试验检验了一闸室待闸船舶停泊条件，总结了一闸室待闸调度方式。运行实践表明，三峡船闸完建期实行四级运行方式下，将下行船舶由靠船墩移至一闸室满闸室待闸，可提高船闸日均通过闸次近3个，通航效益明显。

This paper discusses the fluctuating character of the water in Chamber 1 when No.2 chamber head is operating as the first one under the four-steps shiplock operating mode, expatiates the forming principle of the fluctuation, analyzes the impact on the water fluctuation in Chamber 1 when No.2 chamber head is operating as the first chamber head, puts forward the valve opening pattern satisfying the safety demand when Chamber 1 is waiting, and tests the berthing condition of the ships in Chamber 1 by the experiment with real ships. The facts show that during the course of the Three-Gorges shiplock being fulfilled under the four-steps shiplock operating mode, the ways transferring the ships downriver from near frusta to chamber 1 can increase passing ability of about three ships per day, producing huge navigation benefit.