Abstract: In trench construction of super-deep T-shape pile walls in deep-weak soil layers high water level, with groove walls easy to collapse and vertical resolution of more than 1/300 are two technical issues to solve. Based on construction of T-shape pile walls for Port Said East Container Terminal-Phase 2 Marine Works in Egypt, solutions to the two technical puzzles are studied. The key construction technologies include selection of trench equipments, advance reinforcement of groove walls, construction of guide wall, production of slurry, and excavation of trench. The results show that the vertical resobution of super-deep T-shape pile walls is high without hole collapse. The trench can be finished with short time, low cost and good quality, and good social and economical benefits are gained.