Abstract:In the era of the digital economy, global industrial and supply chains are rapidly restructuring, and enterprises face increasingly complex competitive environments and resource allocation challenges. Digital transformation has become a critical strategy for enhancing competitiveness and optimizing capital structure. This study investigates listed A-share companies in Shanghai and Shenzhen stock markets from 2011 to 2022, systematically examining the impact mechanisms of digital transformation on dynamic capital structure adjustment, along with its supply chain spillover effects. Empirical findings demonstrate that digital transformation significantly accelerates capital structure adjustment speed through three primary channels, mitigating information asymmetry, alleviating agency costs, and enhancing commercial credit availability. Heterogeneity analysis reveals more pronounced positive effects in enterprises characterized by high governance efficiency, intense market competition, operation in low marketization regions, and exposure to elevated environmental uncertainty. Based on the supply chain perspective, it is found that the digital transformation of customer and supplier enterprises has positive spillover effects in the supply chain, and the promotion effect is more obvious when the upstream and downstream of the supply chain collaborate in digitalization. This research provides empirical evidence for optimizing capital structure during digital transformation processes, while offering policymakers crucial insights for advancing digital economy development and supporting corporate transformation and upgrading.