Abstract: Validity generalization (VG) is one of the most useful methodologies to estimate the effect sizes of predictor-criterion relationships based on the techniques of meta-analysis. One of the most important advances on applied psychology in recent 30 years（1977-2007） is the work on validity generalization. This article reviewed on the achievements in VG. Hunter-Schmidt’s meta-analytic procedures made it possible to draw clearer and more consistent conclusions from the body of literature across independent studies about the predictive validity of predictors. Robustness, correspondence and increment quality of the predictive validities of abilities, factors of personality, interviews, and assessment centers had been found

Key words: validity generalization, meta-analysis, predictor, predictive validity