In this paper, we proposed an effective and efficient model to evaluate the white space resource distribution in the floorplan/placement. The model discretizes the chip with a homogeneous rectangular mesh, in which the cost of each grid depends on the white space area and the routing congestion. The model has gotten application in our floorplanner to plan a good white space resources distribution to favor the later stage of repeater planning. On the other hand, non-zero area white-space blocks, which will join the formation of floorplan configurations, are introduced to adjust the amount and distribution of white space resources. Finally, a novel graph-based repeater assignment algorithm is devised to achieve the repeater planning. The number of nets failed to meet the repeater insertion constraint is reduced by 15.6% on penalty of 2.2% area usage reduction.