Deduction is made in this paper for the temperature and snowfall in the mountainous areas of East China daring the Quaternary Ice Age based on climatological theories. At that time solar radiation in the summer half year was weak and the altitude of the Qinghai-Xizang Plateau was low so that the role of the Plateau as a heat “island” to the atmosphere and the associated Qinghai-Xizang high were both weaker than they are today. In addition, the western Pacific subtropical high was weak, hence, the temperature in the summer half year, especially in middle summer, was far lower than it is now while the polar front in the winter half year was strong and to the south, which is a favorable factor for the snowfall in this period.Calculations made for ice-snow mass balance show that the amount of snowfall was likely to exceed that of snow ablation in north-facing valleys. Deduction is made in this paper for the temperature and snowfall in the mountainous areas of East China daring the Quaternary Ice Age based on climatological theories. At that time solar radiation in the summer half year was weak and the altitude of the Qinghai-Xizang Plateau was low so that the role of the Plateau as a heat “island ” to the atmosphere and the associated Qinghai-Xizang high were both weaker than they are today. In addition, the western Pacific subtropical high was weak, hence, the temperature in the summer half year, especially in middle summer, was far lower than it is now while the polar front in the winter half year was strong and to the south, which is a favorable factor for the snowfall in this period. Calculations made for ice- snow mass balance show that the amount of snowfall was likely to exceed that of snow ablation in north-facing valleys.