Potassium dideuterium phosphate (DKDP) with deuterium content of 60% and potassium dihydrogen phoshate (KDP) crystals are grown by "point-seed" rapid growth method. Optical property including transmittance spectra, conoscopic image, light scattering and laser damage threshold (LDT) are measured. The results show that although the infrared absorption edge of transmission spectra is obviously red-shifted, structure perfection and optical homogeneity of DKDP crystal became poorer. Light scattering have no obvious change. We also find that the value of LDT at 1 053 nm has a 2.5-3.8 \times increase compared with that tested at 526 nm and LDT of Z-cut samples is obviously higher than that of tripler-cut samples.