Incremental launching has the characteristics of small disturbance to traffic under the bridge, and has been widely used in the construction of span railway bridges in recent years. At present, variable slope across station has a relatively lack of experience in the Incremental launching construction. Based on the research background of the reconstruction project of the overpass across Changbei station at Shuanggang Street in Nanchang City, a construction monitoring plan is designed to monitor the structural displacement, strain, and central axis deviation during the Incremental launching construction of the bridge in variable slope. Compare measured data with theoretical data, feed back to the site, and adjust the Incremental launching construction linetype to ensure quality and safety of continuous beam arch bridges across station in variable slope, which can provid reference experience for similar bridge Incremental launching construction monitoring.