Supplying uniform pressure ink in continuous inkjet printing system is the key factor for forming uniform and constant speed ink droplets, it is related to the final imaging effects, this research has seldom been reported in these years. This paper studied on the hydrokinetics and uniform distributed mechanics of supplying ink pressure for the continuous inkjet printing system based on the theoretical calculation, CFD (Computational Fluid Dynamics) and the advanced testing equipment. According to the analysis of laminar flow characteristics and the other jetting flow dynamics factors of the ink, a new type of equipment for supplying ink was designed in this paper, including the structure of the transition pipe and nozzle. The shape of the equipment is rectangular, where the flow section is gradually tapered. This supplying ink equipment can make the ink droplets distribute under the equal pressure on the cross direction. This study educed the optimally hydrokinetics parameters for the continuous inkjet printing. The experiments showed that this new supplying ink equipment could make the ink droplets distribute under the equal pressure and uniform velocity on the cross direction, so it greatly improved the imaging effects for the continuous inkjet printing system.