The equilibrium solubility of NaCl-ZnCl2-HCl（～9%）-H2O quaternary system at 25℃was determined and the phase diagram was constructed.This system is complicated with one compound 5NaCl·ZnCl2·0.5H2O which has been obtained from the system and has been characterized by XRD.The result shows that compound 5NaCl·ZnCl2·0.5H2O is the new one which has not been reported before.For compound 5NaCl·ZnCl2·0.5H2O parameter of unit cell is a =14.900nm;c=25.160 and it belongs to quadratic system.
