The Tibet Plateau is extremely high areas with annual average temperature of below 0℃.The silage fermentation at natural low temperature is insufficient and corruptible,however less relevant research about the mechanism of silage at low temperature were reported.In order to improve the silage quality at the Tibet Plateau and establish a low-temperature-ensiling system,this paper mainly carried on the following five parts research:(1)The multiple wheatgrass samples were collected from most regions in Qinghai...