The Kiangsi Soviet period, the second phase of the Chinese Communist movement, began with the establishment of the Chingkangshan base by Mao Tse-tung in late 1927 and ended in the “Long March” in October 1934. The study of this important period had long remained sketchy because of lack of materials. With the release of the Ch'en Ch'eng Collection—a collection of Communist documents, papers, and publications from the Kiangsi Soviet period—in 21 microfilm reels, a comprehensive study of this period is possible for the first time. The bulk of materials of the Collection falls in the years, 1930–1934. The Collection contains over 70 periodicals, six of which were published with regularity and duration. Scattered in several journals, we found 17 articles from the pen of Mao Tsc-tung, which are not included in his Selected Works (Peking, 1965). The materials cover a variety of subjects from the Soviet congresses, the establishment of the Soviet economy, peasantry and labor, the intraparty struggle to the Red Army and its many campaigns against the Chinese Nationalists. Major works in all these areas are briefly introduced here.