Korea has made China as a second domestic market, meanwhile ensured Korea’s economy new vitality and growth impetus by signing FTA with China. Some research predicts Korea’s GDP growth will add extra 0.92~1.25% by the effects of Korea-China FTA. This FTA is influencing all the enterprises in Korea. Korean small and medium-sized enterprises (SMEs) play an important role in Korea’s economic development, Technology innovation, balance of social and economic development, etc. Among these SMEs, small and medium-sized manufacturing enterprises (SMMEs) which take up 10.7% of all enterprises and 22.6% of all employees, SMMEs are Korea economy’s solid chassis. Korea-China FTA is influencing Korea’s SMEs international environment which thus changes their global competitiveness. Analyzing hydraulic cylinder enterprises case can help find advice for future competitiveness of Korean SMMEs’ future competitiveness which represents Korean’s economic competitiveness. This paper analyzed the International Environmental changes of Korea-China FTA’s Effects on Korean Small and Medium Sized Components Manufacturing Enterprises and tried to find suggestions to enhance international competitiveness for them. This paper promoted a case study of Korean hydraulic cylinder industry which is considered to be the representative of Korean component SMMEs. Then this paper made a survey to detect Korean hydraulic cylinder manufacturing enterprises’ basic conditions, import & export status, international environmental changes, major errors and current international competitiveness compared to national and international competitors. After the case study, the component SMMEs’ international competitiveness enhancement suggestions were deduced as follows: Firstly, Korean components SMMEs can enhance ‘China out-sourcing’ and ‘Korean out-sourcing’ to decrease their production cost. Secondly, Korean components SMMEs can enhance their differentiation advantages such as diverse small-quantity production to maintain national market and block international competitors meanwhile looking for potential foreign buyers. Thirdly, Korean components SMMEs can enhance their production management technologies, Know-how technologies, and R&D technologies, and then chalk out new ideas and programs to improve the competitiveness. Fourthly, Korean components SMMEs should avoid excessive competition, enhance cooperation, and get used to the new vertical + horizontal relationship between significant company and SMEs to obtain synergy advantage