This paper investigates key factors on the utilization and improvement directions of national-level technology roadmaps for technology strategies. There are increasing interest in technology roadmaps to respond to uncertain environment and explore some possible directions of future technology development. To challenge the catching-up status in innovation, technology roadmap have been widely developed both in private and public sectors. In spite of recent increasing adoption of technology roadmap, there are few empirical studies on the level of utilization and improvement directions of technology roadmap with the viewpoints from science and technology experts in national innovation system. Most of studies on technology roadmaps have argued normative recommendations and made suggestions based on case studies. This paper examines the key factors on the utilization and future direction of national-level technology roadmaps. Based on survey from 320 experts in science and technology area, this paper analyzes the level of utilitation and future improvements of national level technology roadmap. The level of technological capabilities and participation experience on the roadmap development process have significant impact on the utilization of national-level technology roadmaps. Also there are three future directions to increase the usage of national-level technology roadmaps. The national-level technology roadmap should be improved as a more systematic processes including planning, progress, and outputs. Finally, this paper suggests some implications and future guidelines for national-level technology roadmaps.