This paper investigates the critical role of open innovation (OI) strategies in enhancing the technological innovation capabilities (TICs) of Beijing Runxing Tonghong Technology Co., Ltd., a representative technology-focused SME in China. Recognizing the limitations of closed innovation models in today's dynamic environment, the study examines how Runxing Tonghong leverages external knowledge sources, collaborative partnerships, and ecosystem engagement to augment its internal R&D. Utilizing a qualitative case study methodology involving document analysis and potential interviews, the research maps the specific OI practices adopted by the company (e.g., university collaborations, customer co-creation, strategic alliances, technology scouting). It analyzes the impact of these practices across key dimensions of TIC, including technology learning and absorption, R&D resource efficiency, new product development speed, and market responsiveness. Findings indicate that systematically implemented OI significantly strengthens Runxing Tonghong's ability to access novel technologies, mitigate R&D risks and costs, accelerate innovation cycles, and respond more effectively to market shifts. However, the study also identifies challenges such as managing intellectual property, selecting suitable partners, and integrating external knowledge. The paper concludes that embracing open innovation is not merely beneficial but increasingly essential for Runxing Tonghong to sustain and elevate its technological competitiveness, offering practical insights for similar SMEs navigating the complexities of modern innovation ecosystems.