Investigating all the Great Ice Age events throughout the Earth's history, each was found to follow a strong mountain-making process. Therefore, a hypothesis was put forward with its causality chain as: strong mountain-making process→great disparity in topography on the Earth surface→introducing efficient atmospheric circulation system (plateau monsoon)→increase in global atmospheric heat engine efficiency→generating more atmospheric kinetic energy→enhancing the planetary westerly (under the condition that the huge relief is longitudinal on the whole )→widening the temperature difference between the equator and the polar regions (restrained by the thermal wind law)→sharp cooling in high latitudes and the polars (supposing the solar radiation was approximately constant)→forming a Great Ice Age event.