This paper deals with Cho Soang's achievements and thoughts during the period of 'Korean Liberation', from 1945 to 1950. In this period, Cho Soang tried to found the new united Korean nation which had been the aim of Korean independence movement. His activities had three phases. Firstly, he continued to achieve Korean independence through anti-trusteeship movement. Secondly, he tried to unite Korean penninsula by the dailogue between the South and the North. Thirdly, he tried to accomplish the idea of ‘Three Equalities'. Cho Soang's anti-trusteeship movement was the same line of Kim Goo. His diplomatic way to withdraw the trusteeship was the support to Lee Seungman's diplomacy. So transferring the control over Korean problem to United Nations In 1947, he thought it was the way to found new united Korea. He supported the foundation of Repubic of Korea, which was approved by United Nations, apart from Kim Goo. After 1947, He stressed the significance of United Nations for Korean independence and the withdrawal of 38° line. He thought that the U.N.'s resolution about Korean problem was the denial of trusteeship, and therefore the way to found independent Korea. His participation in the conversations between the South and the North in 1948 was meant by the fulfillment of the U.N.'s resolution, which provided the foundation of united Korea through general election in both the South and the North. After the foundation of Republic of Korea in 1948, he thought that the divided Korean government would take a step to unite Korea peacefully by the international aids in United Nations. Cho Soang suggested the idea of 'Three Equaliteis’ as the leading idea of the Korean independence movement in 1930's. His idea of 'Three Equalities' was adopted as the general principles of the foundation or independent Korea by Korean Provisional Government. After 'Korean Liberation', He tried to make equal society based on the principles of 'Three Equalities’. His program for equal society was changed by situational changes. During the period of anti-trusteeship independence movement, he suggested the social revolution by the organization of young students in poverty. After the foundation of Republic of Korea, he prefered to moderate and gradual line. He thought that it was possible to enter into equal society through putting the sociaistic policies in operation under the representative system.