Abstract: In Metal Injection Molding, Injection, degreasing and sintering are carried out after the metal powder and binder are fully mixed to obtain the feed. The binder in the feed which has always been one of the research hotspots used is the core of the MIM. The rheological properties of the feed and the powder load are important factors for affecting the injection, degreasing and sintering processes. In this paper, the effects of binder components, additives, powder shape and particle size on the rheological properties and powder load of the feeders have been discussed. The additives to improve the feeding performance include compatibilizers, stabilizers, surfactants, etc. After adding the additives and optimizing the particle size distribution and shape, the rheological properties such as the viscosity and rheological parameter of the feed and the critical loading capacity of the powder are significantly improved.