Pinghua used by Miao and Yao nationalities in southwest of Hunan province has manifested communicative function and language vitality declining in different grades. From the point of the intergenerational succession of callan, the reasons for the declining of callan's ability of speaking mother tongue were analyzed by comparing the Miaohua (Unitary Style) in Shuiping village of Lanrong town of Chengbu county with the Donghua (Mixed Style) in...