This study aims (a) to determine the effect of synectics model on creative thinking skill (b) to determine the effect of synectics model on metacognition skill. (c) to find out the relationship between creative thinking and metacognition skills. This study uses a quasi-experimental type with one group pretest posttest design. The study population was 612 junior high school students with a total sample of 242. The instruments used consisted of essay tests which were assessed using the rubric of creative thinking skills and questionnaires about metacognition skill. Data were analyzed based on parametric statistical calculations. The results showed that the synectics model had an effect on creative thinking and metacognition skills. The results of the correlation analysis show R of 0.873. Based on the regression line equation Y = 12.27 + 0.8847x, that every 1-point increase in the score of metacognition skill results in an increase of 0.8847 creative thinking skill.