Focusing on the traditional settlements of Diqiang Ethnic Group in Western Sichuan, the present study analyzes the settlement forms quantitatively from three aspects: boundary pattern, plane structure, and vertical space, aiming to form a data interval describing the characteristics of the mountain settlements and presenting them in three-dimensional space. This data interval can be transformed into parameters that can be evaluated and used and can help to retain the characteristics of the settlement forms, to pin down the unchanging factors in the evolution of the settlements, to promote the conservation of the settlement forms and to explore the construction strategies consistent with the characteristics of the settlements in the process of conservation and renewal.