Hong Kong's national security is the proper meaning of "one country, two systems". Since the reunification, the central government has devoted itself to safeguarding Hong Kong's national security and adopted a series of measures, including formulating the Basic Law of Hong Kong, implementing the fundamental policy of "loving the country and loving Hong Kong", improving Hong Kong's electoral system, and strengthening exchanges and cooperation between Hong Kong and the mainland.

The establishment of the National Security Office in Hong Kong by the central government is based on the actual situation of "one country, two systems" and has been recognized by the Hong Kong SAR government and the vast number of Hong Kong residents. Therefore, Hong Kong National Security Council and Hong Kong National Security Office play an important role in Hong Kong's national security.

Although they play an important role in Hong Kong's national security, their responsibilities and powers are different. The National Security Council of Hong Kong is the decision-making body of the Hong Kong SAR Government to safeguard national security. It is responsible for formulating Hong Kong's national security policies, supervising and coordinating the work of the Hong Kong SAR Government to safeguard national security. The Hong Kong Security Office is an executive body established by the central government in Hong Kong to safeguard national security, and is responsible for supervising and coordinating the work of the troops stationed in Hong Kong to safeguard Hong Kong's national security.

Generally speaking, Hong Kong National Security Council and Angang National Security Office play an important role in Hong Kong's national security, but their responsibilities and powers are different.