Abstract: China's scientific and technological personnel have a low level of class identification, and there are obvious deviations between the subjective class identification and the objective class status. Class identification is influenced by the factors such as personal income, housing situation, professional ranks, managerial position, academic research project, academic paper and so on. The phenomenon of low class identification is the product of dual field of macro society and science-technology, and the dual identity of the general social members and the employees of science-technology. The scientific and technological personnel in the state-owned public institutions have relatively low class identification, which highlights the problem of getting hindered interests.