The purpose of this study is to investigate the longitudinal relationship of adolescents reading time, achievement goal orientation and creativity. We further examine the structural relationship among those longitudinal factors of three latent variables. Data used in this study from the Seoul Education Longitudinal Study (SELS; 2013-2015), Wave IV(7th grade) to VI(9th grade), collecting response of 3,106 Students. Multivariate Latent Growth Modeling (M-LGM) was employed to analyze longitudinal changes of reading time, achievement goal orientation, creativity in three time-points from 7th grade to 9th grade. As a result of the study, reading time, achievement goal orientation, and creativity all increased over time, and there were individual differences in initial values and rate of change. As a result of examining the path coefficient of M-LGM, the initial value of reading time had a positive effect on the initial value of achievement goal orientation.The rate of change in reading time had a positive effect on the rate of change in achievement goal orientation. The initial value of creativity had a positive effect on the initial value of reading time and achievement goal orientation. Reading time, achievement goal orientation change rate, and achievement goal orientation initial value had a positive effect on the creativity change rate. As a result of longitudinal verification of the effect of adolescents' reading time on creativity through achievement goal orientation over the course of an hour, both the mediating effect between the initial values in middle school 1st and middle school 3rd period were statistically significant. Therefore, it is necessary to come up with a plan to provide practical reading time to teenagers at school.