Nowadays, with the high demand of Very Large Scale Integration (VLSI) design and also high work frequency for circuits, the related issues such as noise cancellation, reduction, and modelling have become more important. In order to solve power supply noise problem, in the floorplanning level, this paper develops a new mixed algorithm based on priority-based max-flow algorithm, and decoupling capacitance insertion technique. We considered the new algorithm, as a part of a floorplanner and select the floorplan with the optimized area, wire length, and power supply noise reduction and power supply network design objectives