中央政策組
Cheng has served in various bureaux and departments in the government, including Deputy Head of the Central Policy Unit (1996–1998), Deputy Director of Administration (1997), Deputy Secretary for Information Technology and Broadcasting (later renamed Deputy Secretary for Commerce, Industry and Technology) (1998–2003), Commissioner for Tourism (2003–2006), and Permanent Secretary for Economic Development and Labour (Economic Development) (2006–2007).