To systematically study the vibration characteristics of the bolted conical-cylindrical shell (CCS), this chapter first establishes the basic theoretical framework. Based on the model with uniform interface contact and constant connection stiffness under a given preload, the influence of the bolt boundary on the structural vibration behavior is analyzed. This model not only provides a theoretical reference for understanding the basic dynamic characteristics of bolted connections, but also lays the foundation for the analysis of nonlinear behaviors such as interface slip and separation in the subsequent chapters. Through a combination of theory and experiment, this chapter systematically reveals the vibration characteristics of the CCS under bolted boundary conditions.