The book "Theory of Electroelasticity" offers a comprehensive analysis of the interactions between mechanical and electrical fields in electroelastic structures. It addresses key concepts such as stress, strain, electric field, and electric displacement, which are essential for the development and understanding of sensors, actuators, and other smart materials. The author, Zhen-Bang Kuang, presents innovative theories, including the physical variational principle and the inertial entropy theory, which provide new perspectives on deriving the fundamental equations for piezoelectric materials. These approaches enable a simplified derivation of the temperature wave equation, thus offering valuable insights for professionals in the fields of mechanics, physics, and engineering. The book is aimed at scientists, researchers, and engineers who are engaged with modern materials and their applications across various engineering disciplines.