Mr. Tang studied in Japan as a government student in 1901 1904 and graduated in applied artillery and engineering.
Tsai-Li Tang returned to China and served as staff officer to Yuan Shih-kai. Later he became commander of the artillery regiment of 5th Division in Shantung.
Mr. Tang was sent to Urga, Mongolia, as the chief of the military staff in 1910. Upon the establishment of the Republic, he was Bent to negotiate with the Nanking Government for the unification of the North and South military counsellor to President Yuan Shih-kai, chief of the General Staff from 1915 till 1916.
He was military councillor in the President's Office from 1916 till 1918. He was sent to Europe as Chinese representative to the Allied Military Council in 1918. He was chief military delegate on the Chinese delegation at the Paris Peace Conference in 1919 and travelled in the Balkans and Central and Southern Europe from 1919 till 1920.
While in England 1920 Tsai-Li Tang was knighted (K.B.E.) by King George. Then he returned to China in 1920 and resigned from the General Staff. He was made a Chiangchun (member of the College of Marshals), member of the commission on Mongolian Affairs in 1922, director-general of the Railway Guards, Ministry of Communications from 1923 till 1928.