In this study, European Union’s general migration policy is studied. Also, immigrants in European Union and their problem are mentioned. This study is studied by explanatory approach and literature review method. The problem during the research is that there is not much source about problems of immigrants in European Union. European Union’s policy on immigrants in European Union is based on controlling and integration. Controlling is possible via legal migration. Integration is possible via fill the gaps between cultures. As a brief, common problems of immigrants (asylum seeker, refugee, kids of refugees) in European Union are these: problems because illegal entrance, problem of reaching to education, reaching to health service problem and assimilation problem.