Boss Steve Watt was without Alex Flisher, Liam Friend, Khalil McFarlane, Sidney Sollis, Lee Prescott and Harry Stannard against a strong Whites line up managed by former ‘Gate Manager Chris Kinnear.
Margate started strongly with Dave Martin heading wide from an in-swinging corner from Matt Bodkin. Despite the strong ‘Gate start they fell behind on five minutes as Jamie Allen tapped home from six yards after a mazy run down the left by the impressive Kane Richards.
The hosts almost doubled their lead immediately as Lenny Pidgeley fantastically denied Ryan Bird from six yards. Margate almost levelled minutes later as Orlando Smith unleashed a fierce effort inches wide of the post from 25 yards out.
Dover created further chances with Bird and Allen seeing efforts again well saved by Pidgeley. The hosts doubled their lead in the 49th minute as Kane Richards raced down the left before side footing past the diving Pidgeley.
The Blues fell further behind in the 67th minute as Jamie Allen poked home again from six yards from another Richards cross to condemn the Blues to their second pre-season defeat.
Margate are back in action on Tuesday 1st August as they continue pre-season away to East Grinstead.