Li Tchuin studied during his youth at the China National Institute and Nanyang College (now Shanghai Jiao Tong University) in Shanghai and the Customs College in Peking.
Upon establishment of the Republic in 1921, Mr. Li was appointed a secretary in the Office of the President, later he was sent by the Government to study in England and France. Also he was appointed by the Ministry of Foreign Affairs as a superintendent of Chinese laborers in France in 1917, he was appointed Vice-Consul at the Chinese Consulate-General in Paris in 1919.
Li Tchuin was promoted 2nd class secretary of the Chinese Legation in Paris in 1922, Consul-General at Singapore in 1927, Consul-General in Canada in 1929, Consul-General in Paris in 1933. He was also promoted Minister Plenipotentiary to Peru in March, 1934.