Chang was much interested in the question of foreign trade. After his return he began to organize Embroidery and Lace Works at Nantungchow with branch offices at Shanghai and New York. In 1919 Mr. Chang was elected president of the Administrative Board of Nantung Industrial Enterprises. Later he became president of the Huai Hai Industrial Bank. In June of the same year he was appointed concurrently the Secretary-in Chief of the Kiangsu Grand Canal Improvement Board. In November 1920 Mr. Chang was appointed Secretary of the Woosung Port Construction Board. In August 1921, he was elected a member of the Kiangsu Provincial Assembly. In July 1922, Mr. Chang was appointed by the Peking Government to study the industrial conditions in Europe, America and Japan. At the same time he was conferred the Second Order of Tashou Chiaho. In January 1923, Mr. Chang was appointed expectant Envoy Extraordinary and Minister Plenipotentiary. In April 1923 he was conferred the Third Order of Paokuang Chiaho and in August, the Second Order of Wenfu. In September 1923, Mr. Chang left Shanghai with his staff for America on the Industrial Mission, returning in March 1924. In May 1924 he was appointed Envoy Extra ordinary and Minister Plenipotentiary to Chile.
