In April 2019, Chang Chih-lun contested the Kuomintang party primary for the 2020 legislative election. He was seeking the New Taipei 8 seat in the Legislative Yuan once held by his father.[3] He lost that contest,[4][5][6] and was placed on the proportional party list instead. When the list was first announced, Chang was ranked in the 27th position.[7] When the list was finalized, Chang was listed 26th.[8][9] The Kuomintang won 33.36% of the party list vote, enabling thirteen legislators to take office; Chang was not seated to the Legislative Yuan.[10][11] In March 2020, Chang was elected head of the Kuomintang branch office in Zhonghe.[12] Chang received KMT support to run in the 2024 election and faced Democratic Progressive Party candidate Justin Wu and Taiwan People's Party candidate Andy Chiu.[2][13][14] Chang was elected to the Legislative Yuan in his second bid for the office.[15][16]