Abstarct: In recent years, the rapid growth of technology and the increasing demand for easier and more efficient energy solutions have led to the widespread development of Wireless Power Transfer (WPT) systems. This technology enables the wireless charging or powering of electronic devices without the need for physical connections. WPT has been applied in various fields, including wireless charging for portable electronics, medical devices, and even for energy transfer to electric vehicles, indicating the crucial and growing role of this technology. Despite its benefits, WPT technology faces challenges related to short transfer distances, electromagnetic interference, and increased magnetic losses. To address these challenges, extensive research has been conducted to improve coil structures and enhance magnetic field performance. One innovative approach that has gained significant attention in recent years is the use of mextamaterials with unconventional electromagnetic properties such as negative permeability or permittivity. These materials can effectively manipulate the way electromagnetic fields propagate through space, thus significantly improving the performance of WPT systems. Wireless power transfer is a promising method for powering electronic devices without physical connections. However, the efficiency of this transfer, along with the short distances and electromagnetic leakage, are commonly recognized as the main barriers to the widespread adoption of WPT technology. Electromagnetic mextamaterials used in WPT systems offer a novel approach for improving efficiency and mitigating electromagnetic leakage. This chapter aims to provide a general overview of the current studies and achievements in wireless power transfer systems baxsed on electromagnetic mextamaterials. It begins by explaining the principles of energy transfer in WPT systems baxsed on magnetic resonance coupling. Additionally, different types of electromagnetic mextamaterials, their mechanisms, and fabrication methods are discussed in detail. Furthermore, the applications of mextamaterials in WPT systems are explored, and the technical challenges related to operating frequency and the miniaturization of design are reviewed. This innovative technology holds vast potential for future energy transfer applications across various industries.