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从发展复合肥料出发，研究了ＣａＳＯ４Ｃａ（Ｈ２ＰＯ４）２－Ｈ２Ｏ体系及其三元边界体系Ｃａ（Ｈ２ＰＯ４）２－ＣＯ（ＮＨ２）２Ｈ２Ｏ在２５℃时的等温溶度三元体系中形成一个新化合物Ｃａ（Ｈ２ＰＯ４）２·ＣＯ（ＮＨ２）２．四元体系溶度图可以指导商品普钙磷肥转化为含脲络合复肥．
Starting from the development of compound fertilizers, a new compound Ca (H2PO4) 2-H2O system and its ternary boundary system Ca (H2PO4) 2-CO (NH2) 2H2O have been studied in isothermal solubility ternary system at 25 ℃ (H2PO4) 2 · CO (NH2) 2. Quaternary system solubility diagram can guide the commodity calcium phosphate conversion into urea complex compound.