Abstract: Based on the snow vertical temperature profiles measured during CHINARE2003 Arctic Expedition,the temperature distribution in snow is described by using one-dimension thermal transfer equation,and the effective thermal diffusion coefficients and thermal sources.The zero thermal source is defined as the snow without water.The evaluation method of the water content in snow is set up with the known physical parameters of snow and ice.The relation of water content and the snow temperature,and the water content distribution with time and space are given.