The purpose of present study was to examine (1) coaches leader behavior type, (2) team cohesion, and (3) the relationship between the types of coach's leader behavior and team cohesion in “good performance” and “bad performance，basketball teams. Two hundred and sixteen athletes arid, nineteen coaches d nineteen high school basketball teams from Seoul, Incheon and Kyongee were selected, and questionnaires measuring Leadership Scale for Sports (Chelladurai & Saleh., 1980) and sports cohesion (Lee et al, 1993, 1994》were administered The 'good performance” and ‘bad performance” teams were determined by team's winning records. Independent t-test and stepwise multiple regression were used for statistical analyses. The conclusions from the findings are; (1) The coaches of “bad performance’’ teams tend to use more Autocratic behavior and Social Support; behavior than the coaches of good winning record teams, (2) The “good performance’’ teams have higher task oriented cohesion than the ‘bad performance teams, (3) Coaches' Training and Instruction behaviors have a positive influence on cohesion of basketball teams regardless oi their team performance, and (4) Coaches' Autocratic behaviors have a negative influence on the cohesion oi the “good performance” teams, while coaches’ Social Support behaviors have a positive influence on the cohesion of ‘bad performance” teams.