Its advantages are as follows: 1) the parts are close to the final size, have good smoothness, reduce the follow-up processing cost, and minimize the loss of waste products; 2) It can produce complex or unique shape parts that cannot be manufactured by other processes; Due to the unique process of powder metallurgy, metal injection molding (MIM) can produce parts with highly complex shape features. 3) The porosity of the product can be controlled to meet the requirements of self lubrication and wear resistance of the product. 4) according to the calculation of economic advantages of powder metallurgy, compared with the traditional machining process, the powder metallurgy process can save 60% energy, the material utilization rate is up to 95%, the production process is green and the production cost is economic.