This paper briefly summarises Georg Lukacsˊthought on social cognition in History and Class consciousness,including his criticisms for three improper social cognitive methods,his advocacy to the proper method and his understanding of the criteria through which the social cognition can be measured, and at the same time evaluates it.

Social self-criticism includes criticism of social cognition and the "original" criticism of social existence.

Aesthetic pursuit of modern social cognition on the basis of Marx s proposition that man pursues the beautiful in social practice has three forms of expression:daily social psychology,explanation of social theories,and decision of social planning.

A psychological adult should be self-conscious,society-conscious correctly and can self-control properly.

Based on analysis of social epistemology and speech act theory of scientific knowledge, it shows that other’s words or testimony play indispensable role in knowledge enterprise.

That how to give it an epistemic appraisal, but not a description of new generation s sociology of science, is a realistic issue which contemporary philosophy of science and social epistemology confront with.

With the emphasis on Fuller s social epistemology,the paper discusses three solutions to social epistemology well recognized in western academic community,which is brought about by the legitimization of scientific knowledge.