Rubber products are widely used in all aspects of oil and gas drilling and production, which play an important role in oil and gas development. The performances of rubber products determine the safe and efficient development of oil and gas. In this book, rubber experiment and the constitutive model have been introduced. The rubber sealing ring, metal-rubber sealing structure, stator rubber of PDM, wellhead BOP and downhole rubber packer have been investigated. The mechanical properties and sealing properties of rubber structures have been studied. These contents can provide a basis for the design, manufacture and maintenance of rubber structures.