The purpose of this study is to identify and explain legislative function of Gyeongsangnam-do Provincial Council focused on the 7th, the 8th, and the 9th period. For this purpose, the author built evaluation model and analysed 676 ordinances referred to discussion at the council table. The analysis result of three sessions' legislative function showed very differently from period to period. The legislative function of the 7th council period was very poor as a whole. But that of the 8th period and thereafter was greatly improved compared to that of the 7th period in the proportion of council law proposal, the rate of council law modification and etc. The researcher pointed out several reasons why these changes took place. They included the introduction of compensated salary system, appointment power shift about clerical staff of the council from local government head to council secretary-general, expansion of council secretariat including installation of legislative policy research organization and ect. In conclusion, the continuous system reform is needed including the status of councillors, law making supporting staff etc. Furthermore, the periodic assessment of legislative functions is required.