For guaranteeing the stability of blisk twisty tunnel in ECM, a process mode was presented,where the tangential velocity of cathode relative to workpiece kept steady in the whole process. A mathematics model of the movement of cathode and workpiece was established,and the velocity matching mode of cathode and workpiece was analyzed. Keeping the unidirectional speed of cathode steady in the whole process, the machining gap and current fluctuate dramatically，which will lead to the process is unstably and the machining accuracy decreases in certain extent. That the tangential velocity of cathode relative to workpiece maintains constant contributes the machining gap keeps identical in the whole process and ECM of blisk twisty tunnel is carried out smoothly. For conforming the rationality of the movement mode，the experimental investigations were carried out. The results show that the short circuit happens with the same linear speed. However, the process finished stably with the constant tangential velocity and the machining accuracy is better than that with the former mode. 

为保证整体叶盘扭曲通道电解加工的顺利进行，提出了工具电极相对于工件的运动在全程中保持切向恒速的加工方式。建立了曲面段中工具电极和工件运动的数学模型，分析了工具电极和工件的速度匹配方式。阐述了单向恒速和切向恒速两种运动方式对加工稳定性的影响：采用工具电极在加工过程中单向恒速的方式，加工间隙和加工电流波动较大，导致加工过程不稳定并使加工精度降低;而工具电极切向恒速的运动方式使加工间隙稳定，有助于扭曲通道电解加工的顺利进行。为了验证切向恒速运动方式的合理性，进行了工艺试验研究。试验表明，采用单向恒速的运动方式在加工过程中发生了短路现象，而采用切向恒速的运动方式加工过程稳定，加工精度高。

整体叶盘, 电解加工, 轨迹, 切向恒速