The purpose of this study is to investigate the relationships between teachers' irrational beliefs and the identification in teacher professional development evaluation in junior high schools in Changhua. The methodology adopted in this study is questionnaire survey. 513 junior school teachers in Changhua were chosen by stratified random sampling method. The degree of teacher's irrational beliefs in teacher professional development evaluation was above the average. There were significant differences on teacher's irrational beliefs in teacher professional development evaluation among different gender, age, educational background, teaching seniority, and the location of service. The degree of teacher's identification in teacher professional development evaluation was above the average. There were significant differences on teacher's identification in teacher professional development evaluation among different gender, age, educational background, teaching seniority, and the location of service. There was negative correlation between teachers' irrational beliefs and the identification in teacher professional development evaluation. Finally, recommendations were provided for the teachers, educational institutions, schools, and researchers.