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测定了四元体系KCl－K2SO4－CO（NH2）2－H2O及边界三元体系K2SO－CO（NH2）2-H2O在25℃时的溶度及饱和溶液密度值和折光率，绘制了相应的溶度图及相应的组成-性质图．测定并绘制了该四元体系K2SO4单饱区的溶度面、折光率面和密度面图．两个体系的溶度图均属于低共饱型，平衡固相为组份化合物．
The solubility and saturated solution density and refractive index of the quaternary system KCl-K2SO4-CO (NH2) 2-H2O and the boundary ternary system K2SO-CO (NH2) 2-H2O at 25 ℃ were measured. The solubility map and the corresponding composition - properties map. The solubility, refractive index and density of K2SO4 mono-saturated zone of the quaternary system were measured and plotted. The solubility diagrams of both systems are of low total saturate, and the equilibrium solid phase is the component compound.