Abstract: Based on the construction of excavation cofferdams and pumping station foundation underneath pipelines in soft soils, the effect of the construction of excavation cofferdams and foundation on the pipelines and their protective measures are studied. The effect of the construction of the cofferdams and foundation on the pipelines is the key consideration because they are under the cofferdams and in the floor of the pumping station foundation. Therefore, based on the safety control standards, numerical models are establised to analyze the effect of the construction on them. The results show that the cofferdam construction has considerable vertical loading impact on the pipelines, inevitably creating the deformation of the upper soil and causing the displacement of pipelines in soils. At the same time, the stress state changes as well. However, using the appropriate reinforcement measures, the safety of the pipelines can be guaranteed during the construction. The present results can be used to optimize the design and construction and provide reference for other similar projects.