Abstract: Taking the deammoniation waste liquor of soda ash in Zhongyan Qinghai Kunlun Salt Industry Group Company Limited as the research object，liquid phase and crystalline solid samples during the different evaporation stages of deammoniation waste liquor were prepared through the heating evaporation and filtration separation methods.The samples were also tested and analyzed so as to study the change law of physical-chemical parameters in the evaporation process.Results showed that the density and viscosity increased，the boiling point raised，pH decreased，Ca2+ and Cl- concentrations increased，SO42- concentration decreased，and Na+ concentration increased firstly and then decreased with concentration of deammoniation waste liquor increased in evaporation process；As there needs to evaporate a large amount of water in earlier stage，if the saline evaporation could be adopted in the high spontaneous evaporation area energy consumption could be effectively reduced.

Key words: deammoniation waste liquor, evaporation, physical-chemical parameter