Abstract: In order to enhance the quality of iron-iron phosphorus (Fe-Fe3P) mixed powder, a binder based on hyperbranched polyester (HBP) was developed, and Fe-Fe3P bonded premixed powder was successfully prepared. Scanning electron microscopy (SEM) results show that the proportion of small particles (≤10 μm) in the bonded premixed powder (bonded mixing) is 0.65%, significantly lower than that in the un-bonded premixed powder (conventional mixing, 5.93%), suggesting that hyperbranched polyester can effectively bonds small Fe3P particles (D50=4.85 μm) to the surface of large iron powder particles (D50=82.74 μm). In addition, compared to other structural hyperbranched polyester binders, the proportion of small powder particles in the terminal polyol hyperbranched polyester binder premixed powder is relatively lower, which proves that the terminal polyol hyperbranched polyester binder exhibits a better binding effect. Simultaneously, compared to parts produced from conventional Fe-Fe3P mixed powder, the part manufactured from Fe-Fe3P bonded premixed powder exhibit superior uniformity in phosphorus element distribution and increased strength.