The head of the Foreign Ministry's Office in Hong Kong has underlined a need to gain an in-depth understanding of the country and integrate into the nation's legal developments, saying it's important for young people in the city to visit the mainland.

Cui Jianchun, commissioner of the Ministry of Foreign Affairs in Hong Kong, on Wednesday also told participants of a legal talent exchange programme they needed to learn more about the "history and reality" of the country to be able to tell a "good story" to the rest of the world.

Secretary for Justice Paul Lam, for his part, said one can only effectively safeguard national security and social justice by getting a full understanding of where the nation is heading in terms of its development on various fronts, such as the political system, economy and technology.

Exchange participants will visit Beijing and Kashgar, Xinjiang, during the trip.