In his early career, Duh worked as a specialist at the MOEA National Bureau of Standards in 1983–1994, Executive Officer and Section Chief of 5th Directorate of the Executive Yuan in 1994–1997, Senior Technical Specialist of the Industrial Development Bureau (IDB) in 1997, Director of the 6th Division of the IDB in 1997–2001, Chief Secretary of IDB in 2001–2003, Deputy Director-General of the MOEA Small and Medium Enterprise Administration in 2003-2004, and as Chief Secretary of Council for Economic Planning and Development in 2004. He then remained in the MOEA serving as the Director-General of the Department of Commerce in 2004–2006, Counselor in 2006–2007, Director-General of the Department of Industrial Technology in 2007-2009m and Director-General of the IDB in 2009–2012.[10][11]
Economic Affairs Vice Minister
Chang Chi Foodstuff Factory Co cooking oil scandal
Responding to the scandal regarding the adulteration and mislabeling of cooking oil made by Chang Chi Foodstuff Factory Co. in October 2013, Duh said that although the cooking oil company had obtained the Good Manufacturing Practice (GMD) certificate, the company might give wrong information regarding their manufacturing process to the Industrial Development Bureau. He said that currently the bureau is reviewing the GMD system and might require manufacturers to present its export and import activities and declaration and to allow on-the-spot inspection of their production lines when seeking certification.[12]