This study aims to examine how small and medium-sized enterprises (SMEs) in developing countries can leverage cross-border e-commerce to enhance their export performance, with particular attention to the roles of internet infrastructure, government policy environment, and competitive advantages. While existing research has extensively explored e-commerce's impact on large enterprises in developed economies, limited attention has been paid to SMEs in developing countries and the external factors affecting their e-commerce success. Drawing from the Resource-Based View (RBV) theory, we propose a conceptual model investigating the relationship between cross-border e-commerce participation and export growth, moderated by government policies and mediated by customer coverage rate. The study will collect data from SMEs engaged in cross-border e-commerce across multiple developing countries through surveys and secondary data sources. Our research methodology will employ structural equation modeling to test four hypotheses: (1) higher e-commerce participation leads to increased export growth, (2) better internet infrastructure enhances export performance, (3) improved customer coverage through e-commerce drives export growth, and (4) favorable government policies positively moderate the e-commerce-export relationship. The expected findings will contribute to both theory and practice by illuminating how developing country SMEs can effectively utilize cross-border e-commerce platforms and external resources to overcome traditional trade barriers. This research will provide valuable insights for policymakers developing e-commerce infrastructure and regulatory frameworks, while offering practical guidance for SMEs seeking to expand their international market presence.