Being an advanced construction technology, the high-pressure swing cut-off wall is extensively applied in many kinds of anti-seepage project in China. General construction technology is divided into order Ⅰ and Ⅱ. The high-pressure technology with non-order method used in the project is not only good for piles overlapping and speeding up the construction schedule, but also good for control of cutting-off wall thickness to build up the foundation for the promotion and application of high-pressure cut-off wall.