It used multiple-case study method,took four listed companies as examples,and examined the relationships among technology strategy,RD investment structure,and innovation performance. According to the research results,technology strategy is directly and positively related to RD investment structure and indirectly affects innovation performance through RD investment structure. In addition,RD investment structure and innovation performance vary with the change in technology strategy. Meanwhile,different RD investment structures and innovation performance under different technology strategies have been examined. The research results and conclusions develop the theoretical research on the relationship between technology strategy and RD structure,and can serve as a reference to match a firm's technology strategy upgrade and RD investment structure.