Determined to overcome her weight issues, Cheng started a strict fitness regimen at the age of 16.

In 2005, Cheng played the part of Snow White in the Hong Kong Disneyland opening ceremony.

[2] Cheng's first music video, 靠自己, "Kaau Zi Gei" (literally Depend on Myself) aired on the TVB prime time show Scoop in 2006.

Cheng recorded and showcased her music video, Connected Hearts on an October 2007 episode of the popular Hong Kong television show, Enjoy Yourself Tonight.

She spoke on stage about how a young mother in Sichuan had sheltered her baby from the falling rubble with her own body and remarked on how noble this self-sacrifice was.

On 25 July 2008, Cheng took part in a live radio show with fellow Hong Kong artiste Hins Cheung.

During the outside broadcast on Metro Radio, Joyce and Hins sang an English a Capella duet live.

Hins praised Cheng's musical talent and added that he hopes they will be able to perform together on stage in the future.

On 2 July 2010, Cheng signed to the Record Label, Stars Shine International Limited (星煥國際有限公司).

On 31 July 2010, Cheng guest-starred in "Off Pedder" fellow co-star, Cholam Wong (王祖藍)'s first stage show at the Queen Elizabeth Stadium.