After Taiwan government passed discretionary investment business, financial holding company Act and so on, the security investment trust companies develop rapidly and face competition. How security investment trust industry can survive and keep advantage in this competitive environment becomes the main purpose in this study. The study applied describable statistic, factor analysis, one-way ANOVA and Scheff'e multiple comparative analytic approach. According to the analysis, there are total 8 key success factors in security investment trust industry. The order in accordance with their importance degree as following: ability of risk control, marketing strategy, marketing competition, leading ability of management, employee welfare and belonging, personnel's quality and financial managerial ability, fund operation and internationalized condition. In the meantime, the study appears that there are apparent differences of cognition of key success factors in internationalized condition factor because of the difference in company's nature and personal job title. As a result of study, it can be used as an important reference on present strategy planning for security investment trust companies. Also, it can help security investment trust companies to have better competition advantages, and then improve the operation performance.