The director of the central government's liaison office, Zheng Yanxiong, on Saturday said that the city's 'One Country, Two Systems' governing principle is a world-recognised success, and that local residents know clearly that there's no change in the policy.

Zheng was speaking at a celebratory event in Victoria Park ahead of SAR Establishment Day on July 1.

"Over the past 27 years, which areas in Hong Kong have changed and which have not? While outsiders can pretend not to know, local residents clearly know that there's no change to the city's governing principle," Zheng said.

"We can clearly see that the 'One Country, Two Systems' principle has not changed. The city's high degree of autonomy has not changed, its legal environment has not changed, the business environment has not changed, democracy and freedom have not changed, the way people live their lives has not changed, the city's international character has not changed."

"And at the same time, we can see all the positive changes in the city since the return to the Motherland. Hong Kong has moved from colonial rule to being the 'apple of the country's eye'," he added, hinting that more policies benefiting the SAR will come along the way.

Also speaking at the event, Chief Executive John Lee again noted that Hong Kong will go all out to boost the economy, in spite of challenges that the SAR might face.

"Hong Kong is now undergoing economic transformation and it will face different new challenges. But Hong Kong people have always been able to adapt," he said.

"So as long as we grasp new opportunities, innovate for change, and strive to be stronger in our various posts... we'll surely reach more glorious achievements."

The city's top leader also reviewed his work over the past two years via a social media post.

They include the enactment of the Article 23 legislation, the rolling out of light public housing, efforts to shorten the waiting time for the public housing, the removal of the property cooling measures, as well as the hosting of events to spur economic growth.

He described his administration as a boat navigating the winds and tides, adding that many policies are gradually bearing fruit.