黨外運動
Chen first got involved with politics due to connections with the Tangwai movement. His twenty-five-year political career officially started in 1981. By the end of this year, he was supported by the Tangwai movement and was elected magistrate of Yilan County as an independent party candidate with fifty-two percent of the votes, beating the Kuomintang candidate by a gap of 7000 votes. Thus Chen became the first non-KMT magistrate of Yilan County. Chen would hold the position for two terms (being re-elected with seventy percent of the votes), until 1989.