Combined with a river regulation project,aiming at the problem of slope excavation stability when residents’ houses and underground pipelines exist on both sides of a narrow section of the river,we carry out the stress analysis of U-shaped concrete ditch+single-row pile supporting structure and the study of slope stability of channel excavation，and use the whole calculation mode and method of vertical elastic grade beam to calculate the internal force and displacement of u-shaped concrete structure and pile supporting structure respectively.The results show that the U-shaped concrete ditch+single-row pile supporting structure is safe and reliable.The maximal displacement is 29.03 mm,and meets that the requirement of the horizontal displacement should not be greater than 30 mm in the specification.The construction is convenient,economic rationality,which can provide reference for similar projects.