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In the new high-speed railway construction, many hidden dangers exist when the plan line across the existing highway. Under the premise of construction safety, how to ensure the traffic safety of existing road is the most important key of success construction. In this paper, combining with an engineering example of a new high-speed railway cross an existing highway, continuous beams falsework protection measures is first introduced in detail, then, three-dimensional finite element method is adopted to analyze the effect of falsework foundation deformation on the existing highway pile and pile cap. Calculation results indicate that the strengthening protection measures proposed can control the deformation of existing pile and pile cap, and the method can be referred by other similar projects.