The Beijing Office's main functions are to further enhance liaison and communication between the HKSAR Government and the CPG and other Mainland authorities, and to handle immigration-related matters.

The office enables the HKSAR Government to have a better understanding of the policies and practices on the Mainland and to evaluate their potential effect on Hong Kong. It also updates the CPG, other Mainland authorities and Mainland residents on the latest developments in Hong Kong. The Beijing Office takes necessary action with the Mainland authorities on specific issues following instructions from the relevant bureaux and departments of the HKSAR Government. It also provides information and handles enquiries about Hong Kong from Mainland residents, in addition to dealing with requests for assistance from Hong Kong residents in the Mainland. In 2005, it handled 385 enquiries and requests for assistance.

The office promotes Hong Kong's business and professional sectors. In 2005, the office organised two events in Hebei and Hubei provinces to promote Hong Kong's financial services, professional services, tourism, inward investment and various trade and industry sectors. These were complemented by regular publicity efforts through the mass media, such as a weekly programme with an estimated audience of about 1.5 million broadcast on China National Radio. The office also maintains close contact with the Beijing Organising Committee for the Games of the XXIX Olympiad and keeps track of preparations for the Expo 2010 Shanghai China in order to update Hong Kong on business opportunities arising from these global events.

The office processes applications for entry to Hong Kong, conducts negotiations on visa-free access with foreign diplomatic missions in Beijing, handles enquiries on immigration matters, and provides assistance to Hong Kong residents in distress in the Mainland. In 2005 the office received 5 594 entry applications, 14 077 enquiries and 331 distress cases.