The purpose of this study was to investigate on the relationships between the youth smartphone addiction and internal variables(anxiety, depression), external variable(aggression, impulsivity), which was published in Korea from 2010 to 2015. So this study calculated over 89 effect sizes(anxiety), 70 effect sizes(depression), 56 effect sizes(aggression), 39 effect sizes(impulsivity) from 43 studies. The study results were as follows. First, the results indicated that low effect sizes variables included depression, impulsivity. And anxiety showed medium effect size. Lastly, aggression appeared high effect size. Second, the result of heterogeneity analysis confirmed that all moderator variables(years, case number, original scale, published form) on the internal variable(anxiety) explain the difference of size effects between the studies. On the other hand, the internal variable(depression) confirmed heterogeneity on the years, original scale, published form. And external variables(aggression, impulsivity) indicated each of different result. Finally, publication bias analysis was conducted into studies using a method of funnel plot, trim and fill test, egger’s regression test. From the result of this test, it can be seen that publication bias found not appear in this study.