Cheng S. G. graduated from Jiangnan (Kiangnan) Provincial College, Nanking. He got his Bachelor of Science in 1917 and Doctor of Science degrees (Economics) in 1921 from the University of London. Mr. Cheng also studied at Paris and Columbia Universites.
Mr. Cheng served as a secretary to the Peace Treaty Commission of the Ministry of Foreign Affairs and secretary to the Chinese Delegation to the League of Nations from 1920 to 1922. He took a position of an adviser to Ministry of Foreign Affairs. Between 1922 and 1928 Mr. Cheng worked as a secretary and later councillor of Ministry of Finance. He was appointed technical expert to the Special Customs Conference and to the Sino-Russian Conference.
He was known as an expectant Minister Plenipotentiary. Cheng S. G. was appointed special delegate of the Ministry of Finance in Europe in 1928. During the years 1928 to 1932 Mr. Cheng worked as a departmental director of the Salt Administration, Ministry of Finance. Since 1933 he held a post of a councillor of the Political Affairs Readjustment Council in Peking (Beijing). Later Cheng S. G. worked as a Special Commissioner of Foreign Affairs at Peking (Beijing).
Mr. Cheng was a member of American Society of International Law. He was known as a contributor to "Contemporary Review", "Observer", "Annua! Register"(London), "China Year Book (Shanghai)" and "Current Events" (Nanking).