There is a trend of ethnography writing in full-length novels of contemporary of Yi nationality ， among which southwest Edge is a typical one. Feng Liang as a writer of nasal clan has writing ethnography of inherent advantages， their works form the basis with the field survey of ethnography writing paradigm， the novel "southwest" as a concentrated expression of writing ethnography of Feng Liang， describes the nose to the unique natural geographical features and rich and colorful history and culture， have higher aesthetic literature. Of cultural interpretation is a writer explore the important channel of national development and psychological course， author in the southwest of slavery， "Bimo culture and folk explanation"， to express and explore the nose change ethnic people from period to period of reform and opening up and the history of journey， through to the typical shape show the nose of the national spirit and character.