The effectiveness of policy measures in innovation has been a subject of debate due to the heterogeneity of research results. To address this issue, this paper discusses the potential of meta-analysis as a methodology for evidence-based innovation policy by examining three previous Korean studies. The studies compare the effect size of direct and indirect government R&D support for SMEs, identify the key factors that promote technological innovation in SMEs, and determine various factors affecting the adoption of smart factories. The author introduces the results of three research cases and suggests that meta-analysis can be a useful tool for exploring higher-level evidence to establish innovation policies in Korea and beyond.