At Present, metal sealed ball valve with its unique advantages, is widely applied in coal chemical industry, polysilicon, oil refining, offshore platforms and drain system and power plant etc., traditional power station for tight shutoff, high temperature and high pressure difference, switch quickly, the operation condition of the medium containing solid particles, metal hard seal ball valve is the preferred type of valve. But the service life of the metal hard seal ball valve are widespread low, internal leakage, unsmooth operation happen (or dead), in the face of more and more high wear requirements, strong erosion condition, such as wear-resistant ball valve need in surface treatment, such as structure design, component selection and processing for the optimization design.