Abstract：At present, many new changes have happened in our country's social stratum structure, which catch the attention of lots of social science researchers. Facing such a noticeable and complicated problem, however, there are many corresponding theoretical and practical problems that still remain unsolved. This article mainly probes into four sets of problems in this field. They're objective structure and interpretative frame, basic viewpoint and concrete conclusion, stratum category and class concept as well as social progress and social cost.
