Abstract:With the vigorous development of underground space, there are deep foundation pit projects more and more in China. The existing construction equipment and technologies are hard to meet the construction demands of retaining water stop and foundation reinforcement of super-deep foundation pit in China. The rotary jet grouting technology of the most advanced ultrahigh pressure jet agitation pile (wall) is introduced, which is only one in China, and at present, which construction diameter is the largest and depth is the deepest in the world. The characteristics of several large-diameter rotary jet grouting methods are summarized. The application prospect of ultrahigh pressure jet agitation pile (wall) construction method in the city construction is expounded by the practical engineering application examples.