United front work was the most powerful strategy during the Chinese communist revolution. According to PRC's official definition, it means to pick out friends from the enemy side after carefully analyzing the objective. A successful united front helps CCP become stronger and defeat the most prior and important enemy and then the rest. It's true as we look back at the history of Chinese communist revolution. The united front work has also been frequently used since 1949 when the regime was established.. However no policy is without limitation. Different "United Front Work" strategies are needed with regard to different purposes, timing and situations. Have Chinese authority developed different united front strategies to settle new problems? This article tries to examine, through documents of the national united front conference and essays from concerned symposiums, the difference between the strategies during the revolutionary period and those in peace time. After the communist government adopted the reform and opening-up policy, it tried to found the united front work as a science. Conferences are held annually to discuss the united front work from practice to theory. But until now, it's just propaganda, based on the content of official and unofficial publications. Further more most of the conferences or symposiums are no more than official routine work. Scholars in mainland China who study the united front policy can only follow one approach to prove its righteousness, which is to follow the line of Marx-Leninism or to quote remarks from Chinese leadership. Taiwan is concerned about the united front work. Scholars here should find easily its weakness. However old paradigms, based on the experiences during the 1945-1949 civil war, are still regarded as golden rules by Taiwanese researchers who tend to exaggerate the effect of United front work. But they also use the old paradigm of following the KMT's failed experiment during the civil war fron 1945 to 1949. So the R.O.C government adopted the "Three-Nos" policy and the "Be Patient and Withhold" policy for a long time. Now anybody without prejudice knows that is a lost policy. China has now transformed from a closed society to a semi-open one. Taiwan needs not be afraid of the united front work. Contrarily, it needs an engagement policy and its own version of united front work to turn China from an authoritarian regime to a democratic one in order to stabilize the situation in Asia.