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It is important to identify the mid and long-term strategic technologies and evaluate technology level for the establishment of national R&D policy to upgrade technology level in Korea. This paper summarizes the result of technology level evaluation for 99 key technologies of “National Technology Road Map”, which consists of 5 visions, of Korea. The technology level, the technological gap between Korea and world-top country, the role of government to upgrade technology level, etc. were investigated by the survey (total 1,067 respondents) and the interview with experts related to key technologies.The average technology level of Korea was 65.1% of that of world-top country and average technological gap was 5.8 years. The technology level of vision I “Building an Information-Knowledge-Intelligence Society” was 71.6% and highest among 5 visions. The highest technology level among 99 key technologies was 85.6% for “Digital Broadcasting Technology” and the lowest was 20% for “Weather Control Technology”. The major reasons of technological gap were investigated as the lack of R&D personnel (23.8%), the shortage of R&D funds (17.8%), and the insufficiency of basic research (15.4%), in sequence. The average technology level of USA was evaluated to highest in the world. It was presented that the technological power of China increased rapidly in the expert interview.The result of technology level evaluation would be primary information for various national S&T planning, such as S&T basic plan, S&T foresight, technology road map, etc.