ABSTRACT ¡§A¡¨ company concentrates on ¡§Water Jet¡¨ business for more than twenty years, it had grown slowly and steadly. For this reason, the founder would like diversify his existing business from coping as the spinouts of Plastic Group and CPC Corporation, Taiwan. ¡§A¡¨ company did some investments, they are shot-blasting and rust remover automatic machine. And because politic, economic and environment evaluation factors, the spinouts couldn¡¦t be build up as they expected. Thus, results of related business were not good. The research analyze the related potential business by interact effects of vertical integration to break through its difficult position and then expend its business to step into the ¡§Blue Ocean Market¡¨. The research way of this case was adopted a two-steps method. The first step was quality inquiry, and than made use of AHP method to do some related pilot survey. Ten companies of three types industry were subjects of this study. They were the manager of piping assembly industry, structural steel industry and steel plates industry. There were ten questionnaires in quality investigation and quantification item of each step. All together, there were forty questionnaires. The key point of this research was to do qualitative statistical analyze and compare and calculate index weight to apply the order of priority for suitable business classification. By the AHP¡¦s research and questionnaires of the vertically integratation of sandblasting factory in the in the field of Taiwan, we have found the medium-term and long-term result is atmospherics and steady on the first phase which we have asked people to choose the appropriate category. What the heaviest weight of the quantifiable computation is the steel sheet industry (47.1%)¡Aplumbing industry is next best(29.2%). Therefore, the second stage of the research is order of steel sheet industry. The result of qualitative statistic in second stage are ¡§high value-added¡¨ and ¡§optimistically long-term¡¨. The order of result of quantifiable questionnaire is ¡§tank manufacture¡¨, 34.6%; ¡§bridge reinforcement¡¨, 31.3% and ¡§sewage pipe¡¨, 27.8%. As to ¡§large case beam¡¨ just accounts for the weight 6.4%, it does not adapt to make the vertical conformity of process products in sandblasting industry. The weight of the first three products is very close, that means three products also to be adaptable to make the vertical conformity. The choice of business need to depend on the product price trend, it could not operate that only choose the sole product. Key words: Water Jet business, Blue Ocean Strategy, AHP, Industry Analysis