Since powder microinjection molding technology is evolved from traditional powder injection molding, the process steps of the technology are basically the same as that of powder injection molding technology, namely feeding preparation (preparing a uniform mixture of raw powder and binder), injection molding (filling the molten feed into the mold cavity to obtain a pre-formed blank), degreasing (completely removing the binder components in the green blank, That is, the degreased billet is obtained) and sintering (the degreased billet is heat treated so that it has a certain density and mechanical properties). On the other hand, it also inherits the three major advantages of traditional powder injection molding technology, namely low cost, complex shape and high performance. However, when the size of the formed microstructure is reduced to the micron level, more stringent requirements are put forward for raw materials, forming equipment, injection molding and heat treatment process, which is the important difference between powder microinjection molding technology and traditional powder injection molding technology, and also the significance of powder microinjection molding technology research.