The grown solution of dkdp crystal was synthesized firstly , then the relationship between concentrations of metal ion impurities and critical supersaturation was discussed by the measurement of metal ion impurity concentrations 本文首先合成了dkdp晶体生长溶液,测定了合成溶液中部分杂质金属离子的含量,讨论了杂质金属离子浓度和临界过饱和度之间的关系。