The division featured 16 clubs, 14 of which competed in the previous season together with two additional clubs: At the end of the season Faversham Town were promoted to the Isthmian League Division One South
The competition was contested by the 16 teams from the Premier Division over a total of four rounds: three on an aggregate basis (home and away matches) followed by a final match played on a neutral ground (at Folkestone Invicta F.C.
At the end of the season Ashford Town (Kent) R and Dartfords R left the league.
The division featured ten clubs, six of which competed in the previous season together with four additional clubs: At the end of the season Erith Town R and Beckenham Town R were promoted to Division One.
The 2009–10 Kent Football League Reserves Cup, known as the Blu3 Kent Reserves League Cup for sponsorship reasons, was won by Dartford R. The competition was contested by all 21 teams of the Reserves Section over a total of five rounds: the first three were single match knock-out rounds, followed by the semi-finals on an aggregate basis (home and away matches) and then the final match played on a neutral ground (at Welling United F.C.