At the main peak area of Mao Er Mountain, so-call The First Peak of South China, interspersed with some having blunt shaped granite boulders. Whether they are glacial origin? It has significance in many aspects to clarify the phenomenon. For this reason, the author carried out the research from the remote sensing, geology and geomorphology etc. Geomorphology interpretation showing base on Multi scale and multi mode satellite of TM、Quickbird-2 and TM-DEM, At the main peak position of Mao Er Mountain where does not have the formation of glaciers drift gravel geomorphic environment. Through period of forming mountain and glacial period in comparison, although Maoer Mountain experienced Quaternary glacial period at the time, but we can not determine whether there had been glacial events, resulting in huge glacial drift gravel formation. Comparison shows that the mineralogical and petrological characteristics of the bedrock and the boulders, both of them have the homologous relationship, so we speculated that boulder not to move from a distance, and it is from the bedrock peak. Remote sensing lineament interpretation shows that there are five sets of fault are well developed in the granite body of Mao Er Mountain, which they are the cause of granite internal injuries, it is an important internal reason leading to the formation of boulder. We confirmed that these five aspects of the analysis and through the field survey. The conclusion is clear，the granite boulder distributed at Mao Er mountain peak area, which its formation is due to the combined effect of faults in the granite body, weathering and denudation, the slope gravity three kinds of factors. They are only simple weathering and collapse from the bedrock of main peak, rather than glacial boulders.