Abstract: Based on field investigations in Meigu, Zhaojue, Yuexi, Leibo, and Ganluo counties in the core Liangshan Yi region, and under field conditions in which surviving earth-and-timber dwellings are fragmentarily distributed, this paper selects 40 valid samples as its research material. It establishes a feature set of structural practices through a “component-joint-structure” analytical framework, and uses cluster analysis to assist in interpreting the associations and differences among the samples. On this basis, it summarizes a typological pedigree of structures encompassing the “dispersed round-section ‘tailiang’ stacking type,” the “integrated flat-section Chuandou interlocking-frame type,” and intermediate hybrid forms. It further interprets the hybridity of this pedigree in terms of compositional proportion, structural logic, extent of hybridity, and relationships and directions of transformation. From the perspective of technical choices, it examines the range of choices available to local builders under the influence of building habitus, functional rationality, and ideology. By incorporating long-marginalized “non-typical” structural practices into a unified analytical framework, this paper reconstructs the typological pedigree of structures of Liangshan Yi earth-and-timber dwellings, clarifies the genealogical relationship between the two structural logics of “earth-and-timber stacking” and “Chuandou interlocking” within the local building system, and reveals the combination and circulation of earth-and-timber building traditions in the core Liangshan Yi region over the past century.