There are many large shipbuilding companies and also small and medium shipbuilding companies in korea. Small and medium shipbuilding companies have same history with the manufacture of ship from time immemorial. Small and medium ships are intimately associated with life and property of the people, and have an considerable effect on region economy. it is important to promote a balanced development of small and medium shipbuilding industry and large shipbuilding industry to keep up the top competitive power of shipbuilding industry of korea. On the other hand, developed countries like U.S, Australia, and Norway keep up the top competitive power with small ships and make an effort to develop the technology. The conclusion is that cooperation among companies to develop constantly makes an positive effect on the development of each company.All industries with globalization have to revive from the government and the market economy. To be revived the small and medium shipbuilding industry, each companies have to make an effort to improve the high-cost and low-efficiency through technical innovation. Government have to expand indirect support policies to a high degree like a technical development of small and medium shipbuilding companies.Small and medium shipbuilding industry have low technologies, compared with large shipbuilding industry. China has invested technical development on large ship and LNG ship, but China can transmit their technology to small and medium shipbuilding companies. So it will be expected not to be spent much long time to improve the competitive power of mall and medium shipbuilding industry.Not only cooperation among companies, R&D, specialization on small and medium ships, human power and development of automation, but also an expansion of export industry, strengthening of Korea small and medium ships technology institutehave to be performed to keep up the competitiveness.While writing this dissertation, we can conclude that each small and medium ship companies in Korea recognize to escape from high-cost and low-efficiency, but they have a little intention to overcome the fact.World shipbuilding market which is developing through management renovation, have been subdivided and be various. The best way to overcome these inferior business environment that changing the business environment through cooperation among each companies.Common intelligence capabilities, purchasing raw materials, technology development, and marketing can be helpful to most small and medium shipbuilding companies. But it is fact that they do not cooperate efficiently, because they do not want to keep up the cooperation on all sorts expenses.Through researching results of this dissertation, we hope that each small and medium shipbuilding companies improve their business environment and have a competitiveness in a rat race world.