Abstract: With the rapid urbanization in China, increasing population density and environmental complexity along pipeline corridors have rendered traditional "one-size-fits-all" safety clearance standards inadequate for adapting to dynamic risk variations, thereby constraining efficient land use and urban planning. To address this challenge, an optimization model for safety clearance of long-distance pipelines was developed based on dynamic risk assessment. A dynamic risk index system was established by integrating multi-source monitoring data, and risk levels were quantified using a combination weighting method. A functional relationship between risk values and clearance adjustment coefficients was then constructed to enable dynamic, differentiated safety clearance adjustments. An empirical analysis was performed on a 120-km segment of the "West-East Gas Pipeline". The results demonstrated that the model accurately distinguished high- and low-risk areas, reducing the total safety buffer zone by approximately 12% while releasing land valued at about RMB 135 million, all without compromising safety. Additionally, the concept of a "one-map" GIS-based visualization platform was proposed to support scientific pipeline planning, safety management, and efficient land use, promoting a shift from static compliance to dynamic risk prevention and control in pipeline safety management.