Measurements of thermal conductivity of ice crystalline layer grown from water-sodium chloride solution by layer crystallization were explored. Interfacial temperature and growth rate of crystalline layer could be measured during the growth of layer. The method was based on heat balance coupled mass balance in growing the layer. The measurements were carried out at layer crystallization conditions such as cooling rate, mixture composition and subcooling degree. The growth rate of ice crystalline layer in water-sodium chloride system was decreased with increasing concentration of sodium chloride, and was proportional to the sencond power of subcooling degree. The thermal conductivity of crystalline layer was determined by overall heat transfer coefficient and heat transfer coefficients in melt and coolant sides. The overall heat transfer coefficient and the thermal conductivity increased with decreasing the concentration of sodium chloride and the cooling rate.