Abstract: The beam-column connections in traditional timber-framed dwellings employ mortise-and-tenon joints, which exhibit semi-rigid characteristics. Additionally, since the envelope wall vibrate in conjunction with the timber frame, the analytical calculation of its fundamental period becomes complex. In this study, an analytical model of the timber frame - envelope wall system is constructed. Based on a simplified moment - rotation mechanical model for mortise - tenon joints and the fundamental principles of the energy method, an analytical expression for the fundamental period of single - story timber - framed dwellings is deduced. Subsequently, verification is conducted by citing the results of shake table tests, and the results from analytical calculations align well with those obtained from shake table tests. The determination of the fundamental period of timber - framed dwellings can serve as an extension of the basic content in structural mechanics courses. It enhances students' comprehension and mastery of relevant knowledge points and guides them to conduct further exploration in scientific research training related to the course content.