The purpose of this study was to analyze structural relations among learner-centered instructional methods perceived by students, thinking styles and democratic citizenship. The data were collected from 324 middle school students through a survey and analyzed through statistical software such as SPSS 21.0 and AMOS 21.0. Descriptive statistics analysis was implemented to describe the basic features of the data. Also, correlation analysis and structural equation modeling were adopted to estimate relations among learner-centered instructional methods perceived by students, thinking styles and democratic citizenship. Results were as follows. First, learner-centered instructional methods perceived by students positively predicted thinking styles at the significance level. Second, thinking styles showed positive impact on democratic citizenship at the significance level. Third, learner-centered instructional methods perceived by students positively predicted democratic citizenship at the significance level. Fourth, thinking styles were the mediator variable among the three latent variables at the significance level. Specifically, executive in thinking styles showed negative impact, whereas legislative and judicial were positive impact factors. Results in this study could provide implications on democratic citizenship education based on aptitude-treatment interaction.