Chang was born in 1899 in Sichuan Province to a financially struggling but artistic family. His first commission came at age 12, when a traveling fortune-teller requested he paint her a new set of divining cards. At age 17 he was captured by bandits while returning home from boarding school in Chongqing. When the bandit chief ordered him to write a letter home demanding a ransom, he was so impressed by the boy's brushmanship that he made the boy his personal secretary. During the more than three months that he was held captive, he read books of poetry which the bandits had looted from raided homes.