Yang entered
Tsinghua University in 1933 and studied in the department of economics, graduating in 1937. As an undergraduate, he would have preferred to study liberal arts, but because of his father's preference, he entered the department of economics. He nonetheless studied with the eminent historian
Chen Yinke, who supervised his thesis. Other professors and influences included
Qian Mu,
Lei Haizong, and
Tao Xisheng in Chinese studies, and in English,
Ye Gongchao (George Yeh). In 1940, Yang started graduate work at
Harvard University, receiving his M.A. degree in 1942. Charles Gardner provided not only practical help, but moral support. He then assisted
Y.R. Chao in a wartime language program for the United States military, and collaborated with Chao on the
Concise Dictionary of Spoken Chinese (Harvard University Press, 1947), noted as one of the first dictionaries of whole Chinese words rather than Chinese characters. In 1946, he received his PhD degree for his doctoral thesis, “Notes on the Economic History of the Chin Dynasty." (晉書·食貨志譯注). After becoming assistant professor in 1947, in 1958 he became full professor. He taught many graduate students who went on to careers in the field, including
Yu Ying-shih, Kao Yu-kung, Chang Fu-mei,
Chang Chun-shu, and
Rulan Chao Pian. ==Personal life and friendships==