Her career began in 1998, when she was offered to appear in a TV commercial advertising lemon tea. She caught the attention of Stephen Chow after shooting the ad. Later, Cheung made her film debut as a young nightclub hostess in Stephen Chow's King of Comedy (1999), followed soon after by Fly Me to Polaris (1999). The latter role earned her the award for Best Newcomer at the Hong Kong Film Awards. In the same year, Cheung launched her singing career with her first Cantopop album Any Weather (1999). For Derek Yee's romantic drama Lost in Time (2003), Cheung won the award for Best Actress at the Hong Kong Film Awards. She played a young woman who lost her fiancé to a traffic accident which left her as a grieving single mother struggling to make ends meet.
Filmography
* The 601st Phone Call (第601個電話) (2006)
* My Kung-Fu Sweetheart (野蠻秘笈) (2006)
* The Shopaholics (最愛女人購物狂) (2006)
* The Promise (無極) (2005) (Film Nominated in the Golden Globe, HK Film Awards, Golden Trailer, Fantasporto)
* Himalaya Singh (喜瑪拉阿星) (2005)
* The White Dragon (小白龍情海翻波) (2004)
* One Nite in Mongkok (旺角黑夜) (2004)
* Papa Loves You (這個阿爸真爆炸) (2004) [cameo]
* Sex and the Beauties (性感都市) (2004)
* Fantasia (鬼馬狂想曲)(2004)
* Lost in Time (忘了忘不了) (2003) (Won Best female actress in Golden Bauhinia and Hong Kong Film Awards)
* Running on Karma (大隻老) (2003)
* Cat and Mouse (老鼠愛上貓) (2003)
* Honesty (絕種好男人) (2003)
* Mighty Baby (絕世好B) (2002)
* Second Time Around (無限復活) (2002)
* The Lion Roars (我家有一隻河東師) (2002)
* The Legend of Zu (屬山正傳) (2001)
* Para Para Sakura (Para Para 嬰之花)(2001)
* Shaolin Soccer (少林足球) (2001) [cameo]
* Failan (파이란, 白蘭) (2001)
* Everyday Is Valentine (情謎大話王) (2001)
* Master Q 2001 (老夫子2001) (2001)
* Wu Yen (鐘無艷) (2001)
* Twelve Nights (十二夜) (2000)
* Tokyo Raiders (東京功略) (2000)
* Help!!! (辣手回春) (2000)
* The Legend of Speed (烈火戰車2之極速傳說) (1999)
* Fly Me to Polaris (星願) (1999)
* The King of Comedy (喜劇之王)(1999) (nominated as best new actress in Hong Kong Film Awards)
Discography
* C1 (2005)
* Colour of Lip (至愛唇色(新曲+精選)) (2002)
* Shaolin Soccer (2002)
* Party All the Time (2001)
* New and Best Collection (2001)
* Party All the Time (2001)
* Cecilia Cheung (2000)
* A Brand New Me (最新形象) (2000)
* 903 California Red Concert (2000)
* Destination (1999)
* Any Weather (1999)
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