The current intern system of school-enterprise cooperation interiorly caused many social and moral issues in actual operation. With the deterioration of the internship situations, the division of level managers in enterprise as the advantaged group and the disadvantaged group composed by trainee members in the workplace involuntary. However, many observations found that level managers in enterprise exhibited preference for the intern group through explicit attitudes, the advantaged groups preference for disadvantaged groups, the real reason lead to this phenomenon is the internalization of outgroup preference or the implicit attitudes be cover up of advantaged groups under social pressure are still need to be study in-depth. However, in this context ,promote the advantaged group preference for disadvantaged groups will help to remit the dilemma owing to the intern system of school-enterprise cooperation can not be banned immediately.