Potassium dihydrogen phosphate (KDP) crystal is a classic electro-optical material and is the only nolinear optical material used in the Inertial Confinement Fusion(ICF) program. The growth method and seed have a considerable effect on the quality of KDP crystal. In this study, KDP crystals were grown using both conventional and point-seed rapid-growth methods. By changing the directions of seeds, the regeneration sector was decreased and the length of the growth period was reduced. In addition, the grown crystals were made highly transparent and had no visible defect. Optical transmittance performance, crystalline perfection, and the laser damage threshold were measured. The results show that the crystals have high transmittance in the visible and infrared wavebands, and strong diffraction intensity in (001) face with a sharp peak; the damage thresholds of KDP crystals are improved by 1.7~2.1 with R -on-1 method as compared with 1-on-1 method. The grown crystals exhibit excellent optical performance, and the seeds have a considerable effect on the growth and quality of KDP crystal.