Abstract: Facing the upsurge of the people's movement in the turning point of century,the communist party of USA consider the previous concept of class and class struggle with a new angle.CPUSA holds the view that class concepts is not stiff and rigid,but broad and elastic,and the class struggle doesn't appear in pure forms,and based on above analysis,CPUSA doesn't think that the social democratic is the enemy of the party,and what's more it contradicts the concept of industrial concentration to build the coalition g...