The national security law for the Hong Kong Special Administrative Region (HKSAR) marks a milestone in advancing "One Country, Two Systems," said Zhang Xiaoming, deputy director of the Hong Kong and Macao Affairs Office of the State Council, on Wednesday.
Zhang made the remarks at a press conference held by the State Council Information Office to introduce national security legislation for the HKSAR.
The law will serve as a guardian of prosperity and stability in Hong Kong, Zhang added.
Shen Chunyao, vice chairman of the National People's Congress (NPC) Constitution and Law Committee, said the legislation will plug loopholes in Hong Kong's legal system.
Enforcement of the law is of far-reaching significance to upholding and improving the "One Country, Two Systems" policy, said Shen.
It is also important for national sovereignty and security, as well as Hong Kong's long-term stability and prosperity, he added.