On the Reasons of Losing the Falling Tone of Lu'an Dialect

Regarding the Mandarin falling tone's vanishing to this day,people have been prone to description through the categories and the evolution rules.As further studies,we should bring to light why and how the falling tone has been vanishing.So we think the ways and reasons of the falling tone's vanishing of Lu'an Dialect are in nine aspects,which can help explain the reasons of Jiangsu and Anhui Mandarin falling tone's vanishing,and even to all the Mandarin,which can promote mandarin studies.