Secretary for Constitutional & Mainland Affairs Patrick Nip will visit Beijing and Tianjin on September 13 and 14.
He will meet ministry and municipal officials to discuss co-operation between Hong Kong and the Mainland.
Mr Nip will also open the Tianjin Liaison Unit, attend a gala lunch and open the "Together • Progress • Opportunity" exhibition in Tianjin to celebrate the Hong Kong Special Administrative Region's 20th anniversary.
Under Secretary for Constitutional & Mainland Affairs Andy Chan will be Acting Secretary during Mr Nip’s absence.