According to the comprehensive theoretical framework for fostering creativity, an educational program of creativity improvement was designed featured in cognitive aspects, non-cognitive aspects and cooperation & collaboration aspects. 20 gifted and 35 average adolescents aged 14-16 were involved in 4-months-program. Williams Creativity Assessment was used as one of the methods assessing creativity improvement, in which ratio instead of raw score was introduced in statistic analysis. Average students in experimental group were found increasing in creative thinking such as openness and elaboration, while gifted students have no significant improvement. Students were encouraged to exhibit their creativity by any means at the end of program. The relationship of creativity and intelligence is discussed in the present study too.