Abstract: To meet the special machine design, the largesized and high-performance isotropic magnet steel is needed to be developed. The Nd-Fe-B magnet steel produced with traditional sintering molding technology has poor magnetic uniformity and low pass rate and is not suited for large scale production, thus it has high cost. A new XNA8 magnet steel was developed with an injection molding production technology which was continuously studied and improved. After being properly magnetized the axial pull tension, radial rigidity and magnetic eccentricity of the magnet steel can totally meet design requirements. The magnetic property of injection molded XNA8 magnet steel has reached domestic advanced level. Through batch evaluation it is proved that the product has high dimension precision, good magnetic uniformity, and is suitable for batch production with good economic efficiency.