Chang began an independent campaign for the 2020 Taiwanese presidential election, then suspended his run to join the Kuomintang ticket, headed by Han Kuo-yu.

[9] Chang was first appointed and involved in politics as a minister without portfolio of the Executive Yuan in 2012 under the Sean Chen cabinet.

On December 8, 2014, after the ruling Kuomintang lost the local elections, Chang became the vice premier after a cabinet reshuffle.

On 1 February, the then-incumbent President Ma Ying-jeou approve resignation of Mao Chi-kuo, and appointed Chang to form the cabinet to serve the remaining four months during the period of transition of power.

[14][15] In May 2022, Chang was nominated by the Kuomintang as its candidate in the local elections for the Taoyuan mayoralty after a closed-door meeting of the party's Central Standing Committee.