磷酸二氢钾(KDP)类晶体快速生长主要采用点籽晶快速生长方法，三维生长的点籽晶不可避免的会使晶体产生柱锥交界线，从而影响晶体的性能和质量。本文通过所设计的载晶架，改进传统点籽晶快速生长方法，采用点籽晶定向生长方法，成功生长出磷酸二氘钾晶体(70%DKDP)，避开生长晶体中的柱锥交界线取片，并对其氘含量、透过率、抗激光损伤性能以及光学均匀性等指标进行了测试。结果表明：所生长的晶体氘含量符合设计要求，晶体透过率和抗激光损伤性能和传统点籽晶快速生长晶体保持一致。光学均匀性结果表明样片内部无柱锥交界线，对于大口径70%DKDP晶体的生长具有指导意义。

The rapid growth of KDP-type crystals mainly adopts the point seed rapid growth method. The three-dimensional point seed will inevitably lead to the pyramid-prism boundary, which affects the performance and quality of the crystals. In this paper, the traditional rapid growth of point seed method was improved by the designed platform, and the 70% DKDP crystal was successfully grown by the directional growth of point seed. Avoiding the pyramid-prism boundary of the growing crystals, slices were taken, of which the deuterium content, transmittance, laser damage resistance and optical homogeneity were tested. The results show that the deuterium content of the crystals meets the design requirements, the transmittance and laser damage resistance of the crystals are consistent with those of the crystals grown by the traditional rapid growth of point seed. The results of optical homogeneity show that there is no pyramid-prism boundary in the slices, which will guide the growth of large diameter 70% DKDP crystal.