It was 1969 when Chang ran in the supplementary election for the Legislative Yuan as a graduate student in public health at National Taiwan University. Leading up to the election, all she told the public was that she was the daughter of Chiayi mayor Hsu Shih-hsien and a graduate student at NTU.
民國五十八年，張博雅以台大公共衛生研究所學生身分參加增額立委補選，選前她只告訴民眾，她是嘉義市長許世賢的女兒、台大研究所學生。