Objective: To explore the effectiveness of metacongnition training on primary and secondary school student's academic achievement. Methods: Meta-analysis was used to analysis data of 70 independent effect sizes from 52 studies. Results:(1) Metacongnition training for student's achievement is shown to be efficacious with a nearly large effect(g=0.78);(2) There was significant difference among primary、 junior and senior schools' effect sizes which were 1.01,0.62 and 0.78of g respectively;(3) There was also significant diference among excellent students、 medium students and underachievers' effect sizes with 0.60,1.05,0.61 of g respectively; (4) Different subjects had different effect sizes, specifically Chinese g=1.13, Math g=0.61, English g=0.72, Physics g=0.90, Biology g=0.69, Chemistry g=0.48 and Politics g=0.37;(5) Significant difference was not found among effect sizes of differentCategories of Periodicals, namely core journals、 General journals and Dissertation's which was 0.66、0.62 and 0.83 of g respectively;(6) There was also no difference among effect sizes of different training time. Training time that was less than 2 months had a 0.73 effect size of g, while 2 to 4 months was 0.65, and more than 4 months was 0.65. Conclusion:(1) Metacongnition played an important role on primary andsecondary school students' academic achievement;(2) Academic level, subjects and grade were moderators for the intervention effect size, by contrast different journal and training time did not affect effect size.