It is played by teams sent by each District Council of Hong Kong.
In the following season, all 18 district of Hong Kong had sent teams for the league.
The champion and the second of the final round are promoted to the Hong Kong Second Division League.
Project Phoenix is a project held by Hong Kong Football Association which aims to make changes on and help Hong Kong football to develop.
The remaining teams from Hong Kong Third A Division League and Hong Kong Third District Division League will compete in Hong Kong Fourth Division League in the 2012–13 season.