The twelve teams competed against each other in a double round-robin format playing each opponent once at home and once away.
At the end of this stage, the two teams with the fewest points in the aggregate table were relegated to the Serie B for the 2009 season.
The champion will qualified to the 2009 Copa Libertadores Second Stage, while the runner-up and third-place finisher qualify to the First Stage (this slight change from other years is due to the fact that the defending Copa Libertadores champion is an Ecuadorian team).
Imbabura was the only team relegated at the end of the 2007 season by accumulating the fewest points in the aggregate table.
Universidad Católica, ESPOLI, and Técnico Universitario were promoted as 2007 Serie B winner, runner-up, and third-place finisher, respectively.