With the rapid growth of motor vehicles in Beijing，as of the end of 2012，the volume of motor vehicle reached 5200000 . The existing city road resources are difficult to bear the pressure of traffic. Traffic congestion not only waste time of traffic participants，also caused the extra energy consumption and polluting. Public transport is one of the effective use of road resources，environmentally friendly mode of transport. HongKong is the world famous land scarce city，the urban transport remains orderly，safe and smooth governance through the development of public transport. This paper aims to summarize the advanced experience in the development of public traffic system of Hong Kong. Finally，elightenment to Beijing is proposed in the development of Hong Kong public transport combined with the actual situation of the Beijing city.