The purposes of this study were: 1. to develop a suitable coach leadership inventory for the sport teams of each level to use; 2. to verify Chelladurai and Carron's sport situational leadership theory-coach will adopt low task/high relationship, high task/high relationship, high task/low relationship, and low task/low relationship leadership according to the athletes’ maturity level. The subjects were the athletes selected from elementary school teams, junior and senior high school teams, college teams, and social teams. The college athletes could not overlap with social athletes. The total subjects were 1110 athletes. The statistical methods used in the developing “coach leadership inventory” were Pearson product moment correlation, t-test, exploratory factor analysis. In the verification of sport situational theory, task behavior (instruction and training behavior) and relationship behavior (social support behavior) were used to show the chart. The findings were as follows: 1. Coach leadership included instructional and training behavior, praising behavior, social support behavior, communicative behavior, and managing behavior, and their Cronbach' α were 0.84, 0.81, 0.79, 0.82, and 0.78. The total explained variance of this inventory was 55.41%. 2. The coach leadership of social teams, college teams, junior and senior high school teams, and elementary school teams showed low relationship/low task to high relationship/high task form in order. The results did not match Chelladurai and Carron's (1978) sport situational leadership theory.