http://nobelprize.org/nobel_prizes/physics/laureates/1957/yang-bio.html

He went to the U.S.A. at the end of the war on a Tsinghua University Fellowship, and entered the University of Chicago in January 1946. At Chicago he came under the strong influence of Professor E. Fermi.

没说谁是他的导师，只说了费米对他影响很大。