Applying the quadratic growth curve in Hierarchical Linear Modeling to analyzing the growth model of beginning teachers' creative teaching behaviors, this study aims to discuss the effects of creative role identity on the growth trajectory of creative teaching behaviors. There are 78 elementary beginning teachers proceeded with four longitudinal surveys in two years. The research findings show the differences in creative teaching behaviors among beginning teachers and the growth curve rises first and then descends in the beginning two years of teaching. The growth rate in various stages appears positive growth in the first term and then negative growth in the second term. In regard to the total variance of the creative teaching behaviors, the variance among individuals reveals 49.7% and the variance of individual repeated measure shows 50.3%. Moreover, it is also found that a teacher's creative role identity presents positive effects on the preliminary creative teaching behaviors but negative effects on the creative teaching behaviors growth curve.