"The Chinese people are highly confident in socialist democracy with Chinese characteristics and the democracy system that fits the actual situation in the HKSAR," he added.
Carrie Lam, chief executive of the HKSAR, said Hong Kong has not only made significant contributions to the reform and opening-up but has also benefited from the rapid development of the Chinese mainland.
She described the multiple roles of Hong Kong in the country's reform and opening-up as a witness, a participant, a contributor and a beneficiary.
A cooperation memorandum was also signed at the ceremony for the Guangdong-Hong Kong-Macao Greater Bay Area chronicle.
Xie Fuzhan, president of the Chinese Academy of Social Sciences and head of the Chinese Local Chronicles Guidance Group, said the Guangdong-Hong Kong-Macao Greater Bay Area chronicle is expected to promote the active integration of all compatriots, including Hong Kong compatriots, into the overall development of the country.