Poon Chan-Leung joined the HKRep as full time actor upon graduation from the School of Drama, The Hong Kong Academy for Performing Arts in 1991. He played in over 60 productions, including I Have A Date With Spring, The Legend of the Mad Phoenix, Three Sisters, De Ling and Empress Dowager Ci Xi, Forever and Ever, The Crucible, A Matter of 4x6, A Dream Like a Dream, Let Me Love Once, Rape Virus, Formula of a Thunderstorm, The Eccentricities of a Nightingale, Haunted, Haunted Little Star, Departure 00:00, Sweet & Sour Hong Kong, Peach Blossom Fan, The Importance of Being Ernest, Rotate 270˘X, Whose Life Is It Anyway? ,Vassa Zheleznova and Proof. In 2005, he was the director for (Rep 2 Series) Boxer.

Poon was a member of the creative, script-writing and directing team as well as an actor in Crossings. He was also the assistant director of Sweet & Sour Hong Kong.

Poon was nominated five times at the HK Federation Of Drama Societiesˇ¦ Hong Kong Drama Awards, including the Best Supporting Actor (Tragedy/Drama) for his work of High Horse in Black Elk Speaks in 1994, Best Supporting Actor (Comedy/Farce) for Thomas Diaforos in The Imaginary Invalid in 1999, Best Actor (Tragedy/Drama) for Doctor Astrov in Uncle Vanya, Best Supporting Actor (Tragedy/Drama) for Wang Yin-to in Secret Of Resurrection in 2003 and Best Supporting Actor (Comedy/Farce) for Benedict Hough in A Small Family Business, . He was awarded Best Supporting Actor for Black Elk Speaks and A Small Family Business.

Poonˇ¦s acting credits also included the movies An Umbrella Story, The Legend of the Mad Phoenix and Love a la Zen. And for his work of Tong Tik-sang in The Legend of the Mad Phoenix, he was nominated the Best Supporting Actor at both Golden Horse Awards and Hong Kong Film Awards in 1997.