His older brother, then working at National Taiwan University, introduced him to a friend in the import-export business, who encouraged Chang to enter the field. At the young age of 24, Chang went into the bicycle importing business.
當時任職於台灣大學的兄長認識從事貿易的朋友，便建議他從商，在台中地區從事腳踏車代理業務，那年他不過 24 歲。