The Purpose of this study is to explore current situation about discriminative treatment on contracted teacher using relevant case law and regulations, and is to suggest improvement plan for each classified discriminative case. The results of this study can be summarized in the three types of unjustified discrimination comparing with regular teacher. First, as legal status, contracted teacher is considered non-fixed legal status worker between public servant and private worker because he (she) does not have clearly defined regulation. Second, as service period, contracted teacher receives unfair treatment; especially, working on vacation, pay and severance pay, and calculation of career are discriminative treatment examples. Third, as working conditions, there are much unfair conditions such as pay step computation, incentive criteria, and the number of leave days. This study finally suggests legal and institutional improvement plan for solving irrational discrimination on contracted teacher. Specifically, several plans are guided considering the analyzed three types of unjustified discrimination as follows: enacting clearly defined regulation on contracted teacher’s legal status, implementing rational guideline of contracted teacher’s system management, executing teacher training for affirmative awareness on contracted teacher system in school field, and creating rational school climate for solving discriminative treatment.