Born as Chen Si-wen, Ku Feng's family is originally from Shanghai. Ku studied in Beijing where he developed an interest in singing, which led him to his first job as a singer at a fairground's sideshow.
In 1965, Ku formally signed an acting contract with Shaw Brothers where he made around 100 films for them and became most notably known as one of their top character actors. He has worked with just about every top Hong Kong director in a variety of films.
For his performances in Tiger Killer, Ku won two of Taiwan's coveted Golden Horse Best Supporting Actor Awards.