Transition sections in continuously curved inland waterways with lengths less than five times the vessel length pose navigation safety risks,and current codes and standards adopt improvement measures with certain deficiencies.This study comprehensively analyzes the complex force characteristics of vessels and the evolution of navigation trajectories within transition sections.By systematically reviewing existing inland waterway codes and standards as well as relevant domestic and international research achievements,it proposes a calculation method for widening values of transition sections applicable to continuously curved waterways.It also establishes a corresponding planar widening design model for transition sections to meet vessel maneuvering requirements under different scenarios.Test results demonstrate that this widening design method ensures vessel navigation safety.After remediation,vessel track width is reduced by 1-2 m,drift angle decreases by 1°-2°,and navigational flow conditions including lateral currents are improved.Safety clearance is guaranteed for vessels meeting in transition sections under two-way navigation.This research provides a scientific theoretical basis and quantitative support for regulation works of short transition sections of continuously curved inland waterways,and has reference value for similar complex waterway engineering projects.