Cheng began her acting career in the 1970s, initially appearing in Hong Kong television dramas and films. Her breakthrough role came in 1976 when she starred in the popular TV series "The Good, the Bad, and the Ugly." Her performance earned her widespread recognition and paved the way for future success.

Cheng is also dedicated to philanthropic work, supporting organizations that promote education and healthcare. Her charitable efforts have earned her recognition and respect from the community.

Cheng's film career also flourished during this period, with notable appearances in movies like "Pom Pom" (1984) and "Twinkle, Twinkle, Lucky Stars" (1985). Her versatility as an actress allowed her to take on a wide range of roles, from comedic to dramatic.