This thesis intends to explore the relationship between teachers¡¦understanding of the missions and roles of the Teachers¡¦Association and their degree of participation in Kaohsiung County. It aims to: (1) analyze the teachers¡¦ understanding of the missions of the Teachers¡¦ Association.(2) analyze teachers¡¦ understanding of the role of the Teachers¡¦ Association .(3) explore the relationships between teachers¡¦ understanding of the missions of the Teachers¡¦ Association and their degrees of participation .(4) explore the relationship between teachers¡¦ understanding of the role of the Teachers¡¦Association and their degrees of participation. ¡@ To fulfill these purposes, two strategies are employed: issuing questionnaires and holding interviews.The first step is to collect the effective specimen of 472 teachers came from different schools and one-way analysis of variance was used to analyze the difference that teachers with different background work on the teacher Association. At the same time, I analyze the Teachers¡¦understandings on the missions of the Teacher Association and roles were further analyzed by multiple regression analysis. From the different understanding, we can forcast the degree of the Participation in Association. The second step is according to obvious survey results from the first step, to design a five half-structured interview survey. I will interview the teachers with various backgrounds. ¡@¡@The results show: first, teachers have very good understanding of the missions and roles of the Teachers¡¦ Association; second, teachers¡¦ degree of participation depends on the content of the activities; third, the perception of retaining the teachers¡¦ dignity and promoting their profession varies between different sexes; fourth, teachers with administrative positions or not also differ in their perception in striving for teachers¡¦ rights and influencing educational policies; fifth, a teacher¡¦s seniority affects his perception in striving for teachers¡¦ rights and influencing educational policies; sixth, the location of schools affects teachers¡¦ perception in influencing educational policies; seventh, different sexes also vary in their perception in legal, professional, and supervising organizations; eighth, a teacher¡¦s perception in a professional organization is associated with the scale of a school serving; ninth, the perception in autonomous and supervising organizations differs between teachers with administrative positions and teachers without¡Ftenth, a teacher¡¦s perception in autonomous organizations is related with his seniority¡Feleventh, a teacher¡¦s perception in autonomous organizations have something to do with the location of the school¡Ftwelfth¡Athe degree of a teacher¡¦s participation in the teachers¡¦organization can be best shown by their understanding of the services the Teachers¡¦ Association provides. According the above analysis outcome, I bring up five suggestions for a Teacher Association are given.