Two goals from Zema Abbey and one from Paul Wanless were enough to prolong Rovers' record of never having lost to Kidderminster in five Conference clashes.
Iyseden Christie scored his fourth goal in three games but it proved to be nothing more then a consolation for Harriers.
Paul Wanless got the ball rolling for Forest Green when he opened the scoring with a 20th minute free-kick which took a massive deflection off the defensive wall.
There was nothing John Danby could do to keep out the effort but the Kidderminster keeper was completely to blame for the next goal.
Danby, still suffering a crisis of confidence after gifting Grays a last minute equaliser last weekend, let another easy cross slip through his grasp.
Abbey was the grateful beneficiary, stroking the ball into an empty net with the keeper grounded on 34 minutes.
And it was abbey who made sure of the win with his second and Rovers' third goal of 74minutes, capitalising upon a mistake by Daryl Burgess to chip the ball calmly over Danby.
That strike proved to be an important one, killing off Kidderminster who had pulled a goal back a minute earlier through Christie.
The burly striker showed great persistence to work an opening in the crowded six-yard box and roll the ball in at the back post.
Other then that, the below par Harriers created very little with defender Wayne Hatswell providing their main threat with two shots against the woodwork.