張兆輝生喺清貧家庭，家有四兄弟姊妹。細個住喺沙田美林邨附近嘅木屋區。他曾就讀沙田公立學校同模範英文中學（同劉青雲係同班同學）。讀書嗰陣成績一般，小四之後因為愛上足球運動更加無心機讀書。中五畢業前，佢英文科老師建議佢報考無綫電視藝員訓練班，目的係增廣見聞。他之後成功投考第11期無綫電視藝員訓練班（1982年），同期出道者仲有梁朝偉、周星馳、吳鎮宇、李子雄等等。出道初期佢都係喺無綫連續劇裡擔任跑龍套嘅小角色，後來被安排喺處境喜劇《香港八五》飾演「順嫂」次子張鏘，一直到1986年先喺《神勇CID》，《黃金十年》一劇中擔任第一男主角。自此張兆輝不斷參演一些一綫角色，並在電影中客串。到2002年拍攝完《雲海玉弓緣》之後離開無綫。其後於2011年獲無綫邀請回巢拍攝《結·分@謊情式》。
Zhang Zhaohui was born in a poor family with four siblings. When I was a child, I lived in a wooden house near Mei Lam Village in Sha Tin. He studied at Sha Tin Public School and Model English Secondary School (he was in the same class as Lau Ching-wan). When I was studying, my grades were average, and after the fourth year, I was even more in the mood to study because I fell in love with football. Before graduating from Form 5, his English teacher suggested that he apply for the TVB Artist Training Course in order to broaden his horizons. He later successfully applied for the 11th TVB Artist Training Class (1982), and debuted in the same period as Tony Leung, Stephen Chow, Wu Zhenyu, Li Zixiong and so on. At the beginning of his debut, he played a small role in a wireless series, and was later arranged to play the second son of "Shun Sister-in-law" Zhang Qiang in the situation comedy "Hong Kong 85", and it was not until 1986 that he played the first leading role in the drama "Brave CID" and "Golden Decade". Since then, Cheung Siu-fai has continued to participate in some first-line roles and made cameo appearances in movies. In 2002, he left wireless after filming "Yunhai Jade Bow Edge". Later, in 2011, he was invited by TVB to return to the nest to shoot "· Score @ Lies".