Since its establishment in 1919，the CPUSA has experienced many state-supported terrorism and lynching，such as the Palmer Raids in 1919-1920，expelled from trade union by McCarran Internal Security Act of 1950 and outlawed by the Communist Control Act of 1954，etc. The CPUSA played critical roles in the earliest class struggles to organize American workers into unions，and later make mistake on routine to follow Soviet Union aimlessly. Based on these experiences and lessons，the CPUSA promotes bill of rights socialism as its target in 1996. Today the CPUSA always support the Democratic Party in elections in order to defeat the “ultra right”，which may be helpful for CPUSA to stand up in political ecosystem of two major parties-Democrats and Republicans. At the same time，the CPUSA tries to organize the youth through outreach in order to reinforce its class base and manifest its existence. Of course，the CPUSA often demonstrate its special viewpoint on international issues，by which to tell Americans about the truth of capitalism and imperialism from a particular left wing. Anyway either historical or practical data prove that CPUSA will need more great efforts to fulfil its goal.