When he completed the vocational college entrance examination, Chang went to work at Wang's Animation Production Company at the age of 15. From then on, during winter vacations he would work at one of two animation companies, either Wang's or Far Eastern, building up experience.
五專聯考完，十五歲的他就到宏廣卡通公司打工，以後每到寒暑假就在宏廣、遠東這兩家卡通公司進進出出，累積畫卡通的經驗。