After studying Chinese and jazz dance from elementary school, at 17 years old Yeung won a national contest to find new talents, organized by the Taiwainese TV, and shortly after she made several appearances on TV and a bit part in the Taiwanese film of 1985 "Taipei Story", directed by Yang De-Chang. In 1987 she signed a contract with Hong Kong film studio D & B to replace Malaysian action star Yang Zi Qiong and from then she starred in more than 20 martial arts films. From 1994 she combined her appearances in movies with TV series, making more than ten TV productions in only 5 years. Her screen name Cynthia Khan was actually a combination of the names of established Hong Kong stars Cynthia Rothrock and Michelle Khan, whom she replaced in the "In the Line of Duty" movie series.

杨丽菁（英文名：Cynthia Khan ，1968年12月13日－）知名台湾女演员，台湾嘉义市人，后举家迁至台湾花莲定居，家中经营金饰店。台北国光剧艺实验学校舞蹈科毕业，与台湾知名演员李志希、李志奇、孙鹏、庹宗康、屈中恒、林美秀、杨洁玫等皆为同学好友。

　　杨丽菁就读国光艺校舞蹈科时，参加中视才艺竞赛节目《六灯奖》的舞蹈竞技项目，表演民族舞蹈与现代舞，以优美身段与姣好脸蛋被中视当场发掘且加以培训后，曾参演中视1986年八点档连续剧《大旗英雄传》。[1]杨丽菁就读国光艺校时，曾经与李志奇交往4年。

　　杨丽菁十九岁于国光艺校毕业后，只身赴香港影坛发展，初期与香港德宝电影公司签约，演出《皇家师姐》系列动作片（包括《皇家师姐Ⅲ之雌雄大盗》、《皇家师姐Ⅳ之直击证人》、《皇家师姐之中间人》）后开始走红，曾被喻为“杨紫琼的接班人”。其后，她亦踏足电视圈，在两岸三地有多部戏剧作品，与郑少秋联袂出演的《香帅传奇》为其代表作。

　　杨丽菁于取得国际瑜珈师资证书后，积极拓展瑜珈事业，开班教学，并成立“丽致菁华国际有限公司”，出版多部书籍和教学DVD