During the Chinese Civil War, how did the Communist Party of China(CPC) strengthen its legitimacy in Northeast China through propaganda? In this paper, I will discuss this topic by analyzing the propaganda contents of the Northeast Daily, which is the newspaper published by the Northeast Bureau of the CPC to explore what images of the Soviet Union and the United States have been created by the CPC according to its own needs. Specifically, the newspaper created positive and negative images of the Soviet Union and the United States, respectively, to increase the people’s hatred of the United States and love for the Soviet Union. The propaganda also increased the confidence of soldiers and the public in the ultimate success of the war. This paper discusses the differences of CPC's propaganda about the Soviet Union between the North Manchurian base and the Dalian area.