Kwoon Chung was founded in 1948 by the late Mr. Wong Kwoon Chung, and soon became renowned as Hong Kong's best car-cleaning service company. It has since moved on to various other vehicle-related businesses through continuously exploring and exploiting market opportunities.

The Company started a mini-bus student service in the 1950s and developed its passenger transport service in the late 1960s with student and employee bus services. In the 1980s, it expanded into residents' services by providing bus transportation to and from residential developments. Now, it is one of the largest (if not the largest) non-franchised bus operators in Hong Kong.