This study aimed to investigate the relationships among the awareness of junior high school teachers in Kaohsiung County on the principal's situational leadership and organizational communication and the teacher's job involvement. Data collection and analyses were based on questionnaire survey. 692 questionnaires were mailed out, and 633 valid questionnaires were returned. The valid response to questionnaires has reached 98.29%. SPSS and AMOS were conducted with the purpose of compiling and analyzing the statistic. Descriptive statistics, t-test, One-Way ANOVA, Pearson Product-Moment Correlation, Multiple Regression Analysis, Logistic Regression Analysis, and Structural Equation Modeling were utilized to implement the data analysis and verification hypothesis. According to the results, ten conclusions and further implications have been made.