In this research, the study of the meta-analysis is conducted to identify the effect of the constructivist approach on the academic achievements and attitudes of the students. Therefore, related literature of studies done in Turkey is reviewed. Master, doctoral dissertations and articles (between 2003 and 2014), related to the research problem and having statistical data about the study of the meta-analysis, are analyzed by scanning from national and international database in Turkish and English. The study is comprised of 53 studies including the sample about the effects of the constructivist approach on the academic achievements and 20 studies on the attitudes of the students. The effect size of the constructivist approach, between 0,910-1,402 confidence interval, has been found 1,156 (%95 CI, SE=0,125) about the academic achievements and between 0,301-1,208 confidence interval, has been found 0,755 (%95 CI, SE=0,231) about the attitudes of the students by using random effect model. Effect size value of academic achievement is strong level and effect size value of attitude is moderate level to Cohen, Manion and Morrison’s the classification of the effect size (2007). At the end of the study, according to the results of the research, there is a recommendations section for the instructors, program developers, and researchers.