One of the most distinctive elements of traditional Vietnamese architecture is its wooden structural framework. A prevailing belief holds that the traditional wooden frame used by the Vietnamese people is unified from north to south. It is assumed that, during the southward migration process, the Vietnamese carried their construction knowledge with them and gradually simplified the structural framework in their architectural practices. However, this notion does not adequately account for the significant differences between traditional architecture in Central Vietnam (south of Ngang Pass) and that of the North. These differences span architectural form, spatial layout principles, construction techniques, and especially the methods employed in constructing wooden frameworks. Through morphological analysis, structural examination, and comparative methods, this study identifies key differences between the traditional wooden frames of regions north and south of Ngang Pass, thereby asserting their distinct indigenous origins.