Rovers are now five points clear at the head of the table after goals by Mark Albrighton, Gregg Blundell (2), Richard Ravenhill and David Mulligan (pictured) accounted for The Harriers who had Scott Stamps sent off at the start of the second half.
Kiddie's hopes of frustrating Doncaster were dashed on five minutes when Albrighton pounced on a goalkeeping error from Stuart Brock to open the scoring.
Blundell, who had a fine effort saved earlier in the half, doubled the advantage on the stroke of half time when curling a shot past Brock.
Kidderminster's hopes of mounting a revival were thwarted when Stamps saw red for a bad tackle and the home side took advantage of their numerical superiority when Ravenhill slammed home following good work from Paul Green.
Blundell put some gloss on the scoreline when rounding the keeper 10 minutes from time and slotting home, while Mulligan netted his first for the club in injury time.
