Combining factor analysis method with multiple linear regression analysis method, the paper analyzed the influence of some factors on the change of snow depth during snow melting. The results show that snow depth in the period of snow melting negatively correlates with the thermal factors such as surface temperature, air temperature and net radiation, and weakly negatively correlates with vapor factors such as vapor pressure, relative humidity and precipitation. Air current factor such as daily average wind speed has weaker influence on snow depth. The sequence of various factors witch affect snow depth change from big to small is thermal energy, water vapor and air current factors. The significant examination to the regression equation showed that it is feasible to use the method to analyze the factors witch affect the change of snow depth during snow melting.