Plating small sizes and quantities of workpieces requires their random loading in baskets, rather than individual loading manually. This random loading results in rubbing and collision amongst them, thereby making it impossible to conduct chemical reactions for plating, 4as the plating solution is unable to permeate to the overlapping workpiece surfaces. In this study, we developed a new plating technique under floating workpieces, by spraying high pressurized solution into a randomly loaded basket. In addition, this is accompanied by automatic optimization of the concentration through stirring of the plating solution. Experiments show that test samples were successfully floated at the optimized pressure of 50 kN/㎡. In addition, experiments in the plating parameter variation show the best plating performance at temperatures of 40℃, A and B chromate concentration at ratio = 1 : 2, an immersion time of 180 sec, and the pH value of 2.2, under optimized floated conditions.