This research was aimed to identify path diagram (SEM) for organizational characteristics and team effectiveness of Intensive Care Unit (ICU). The factors of organizational characteristics were formulation, centralization, communication and decision making. Fellow satisfaction, team outcomes, team satisfaction and team commitment were used for the factors of team effectiveness. Subjects were 233 working on ICU and analyzed by SPSS and Amos 4.0. Hypotheses that formulation and centalization would effect on team outcomes were supported. However, Hypothesis that communication would effect on team outcomes was denied. Hypotheses that communication would effect on team commiment and fellow satisfaction were supported. Also, hypothesis that decision making would effect on team commiment was supported. The path diagram of modified model was significant (c2=143.106, df=88, RMSEA=0.052, TLI=0.96, CFI=0.971). It is needed to enhance centalization and formulation to increase team outcomes. To develop team commiment, active communication and decision making is required.