Abstract： This article introduces the clinical experience of Professor WANG Xiaoyan in the collaborative differentiation and treatment of recurrent respiratory tract infections in children based on the "constitution-staging" approach. Professor WANG Xiaoyan has proposed a diagnostic and therapeutic framework of "constitution identification throughout the disease course， three-stage dynamic treatment， integration of the root， concurrent， and branch syndromes，" and established the core principle that "the root syndrome is the foundation，concurrent syndrome as the interference，and branch syndrome as the trigger." In clinical practice，she begins by tracing the patient's congenital endowment and evaluating daily health status through inquiry to determine the baseline constitution. Then，integrating the severity of the three stages （acute onset，protracted phase，and remission phase），she progressively analyzes the primary and secondary relationships among internal root deficiency， latent concurrent pathogens， and external superficial triggers. Based on the dynamic pathogenesis， she flexibly modifies classical formulas， supplemented by individualized external therapies and constitutional nursing， thereby forming a distinctive prevention and treatment system.