This article regard literary readings different from oral reading of the first appellation and the second appellation of the Xichang dialect as the object of study, to induct the methods of the first appellation and the second appellation separately and to summary the relative linguistics, It finds the phenomenon that no mater the first appellation or the second appellation,the scope of use literary reading is bigger than the oral reading; Moreover,the origin of the literary reading of the first appellation and the second appellation is same as the law of the basic linguistic of the Sichuan dialect (west-south dialect), however, the origin of the oral reading relates to the language contacting, especially relate to the contacting of North dialect and South dialect.Through the study, The author want to find the reasons of the scope of use of the literary reading is bigger than the oral reading and how the language contacting shaped the phenomenon of the literary reading different from the oral reading.