Historically,Guancen Mountain became a suitable grazing area for its abundant water and grass and its alpine climate.Since the pre-Qin period,relevant records have appeared in various historical data.In the Tang Dynasty,the establishment of prefect apostolic has made this place more attractive so that even AnLushan and Li Keyong coveted the prefect place.The use of horses in farming not only changed productivity there,but also changed people's psychology which had an effect on horse cluture at the same time.And this kind of horse culture was especially prominent in the Tang Dynasty.Nowadays,the name of many villages comprises the word"horse"in Ningwu County and the emphasis on horses in folk customs shows the glory of the horse breeding industry in those days.