After receiving his doctorate, Peng became a professor at National Chung Hsing University. Peng took office as head of the
Council of Agriculture on 15 May 1997. In February 1998, Taiwan reached an agreement to join the
World Trade Organization, but had to make adjustments unpopular with hog farmers, namely opening the nation's market to foreign meats. Peng announced short term losses for the agricultural sector in Taiwan, but vowed to aid livestock farmers. He had backed a first draft of revisions to the Agricultural Development Law as proposed in 1999, but pulled his support after the Council of Agriculture made further changes. The
Kuomintang legislative caucus proposed another set of amendments, and Peng resigned his position on 6 December 1999 in protest. Peng's resignation was approved the next day and Lin Hsiang-nung was promoted as Peng's successor. After the KMT version of the bill passed the
Legislative Yuan in January 2000, Peng released a statement critical of the newly promulgated law. After the end of his tenure as head of the COA, Peng has written for the
Taipei Times on the subject of agriculture. He is against the construction of housing on agricultural land, as well as the use of
ractopamine in livestock. ==Academic career==