No, with this version of air travel, a Chinese visa is not required, as you fly through Beijing in transit and can use the 24-hour visa-free corridor (you can stay in China up to 24 hours without a visa subject to the availability of a ticket to a third country) . Despite the fact that Hong Kong is part of the PRC, it is a special administrative district with considerable autonomy, such as: own laws, legal, monetary, customs and emigration systems, so that in fact then - another country (the third country), the air travel of Beijing-Hong Kong is considered international .