Marxists hold that the proletariat is the basic driving force of reforming society. For the hundreds of millions of workers，the bad factory experience and living environment compel them to launch strikes again and again as instinctive resistance of the proletariat. Since the “May Strike Movement ”，hostility between capital and labor has not been hidden in industrial field and always cause social conflicts. Chinese proletariat show their will and power of reforming society. The history of international communist movement indicates that labor movement is not born to be the fellow traveler of socialist cause and its vanguard party. The power of labor movement is an unpredictable risk for the Communist Party of China. It is an important historic project that how to attract this power in the cause of socialism with Chinese Characteristics. The work of “Investigating National Conditions” promoted by CASS gives an opportunity to Marxists for their investigating the worker groups.