The research questions were (1) whether there were significant differences between teachers with varying background variables? (2) whether there were regarding significant correlations among the principal leadership, school organizational climate and organizational commitment ? (3) whether there were causal relationships among the principal leadership, school organizational climate and organizational commitment ? The subjects were 600 teachers from 32 schools sampled from Taouyuan county. The questionnaire used in this study were “principal leadership questionnaire”, “school organizational climate questionnaire” and “organizational commitment questionnaire”. The data analysis were Chi-square, t-test, ANOVA, Person’s correlations, and LISREL. The results were as the following : 1. The majority principals tended to have “high- consideration” and “high- initiating structure” type behavior. 2. The school organizational climate were divided into two groups such as “open type” and “close type”. 3. There were significant differences between teachers with different background variables regarding the school organizational climate and organizational commitment. 4. There were significant correlations among the principal leadership, school organizational climate and organizational commitment. 5. There were significant differences of organizational commitment of teachers under different principal leadership and school organizational climate. 6. There were causal relationships among the principal leadership, school organizational climate and organizational commitment. At last, this study gave suggestions to educational administration, schools, teachers, and future studies.