Roland G.Fryer Jr.was awarded John Bates Clark Medal in 2015. The research methods that he often uses in his studies are intervention research and field experiment.He focuses on the following research fields: the achievement gap of inter-groups and evaluation of educational policies，economics analysis of group identity，and discrimination and economics mechanisms of anti-discrimination.The educational policies that aim to reduce the achievement gaps between races can be divided into four categories: student intervention，teacher intervention，school and community intervention，and study-behavior intervention.For every kind of educational policy，Fryer provides convincing evaluations by conducting in-depth field experiment and econometric analysis.His research findings present unprecedented sights and inspirations for decision-makers.Fryer studies the rejection of “acting white” which is popular in minority group.His researches in this field make distinctive contribution to identity economics.There is a myth about affirmation action that color-blind is more effective than color-sighted.Fryer and his colleagues prove that this is a wrong opinion no matter they compare the short-term effects or long-term effects of the two kinds of action.Preferential treatment obviously based on race works more effectively than so-called race-neutral preference.