During the metal-powder injection molding, phase isolation between the binder and the metal powders often occurs, which may degrade the product quality in terms of density and hardness. In order to solve this problem, vibration force field is introduced in the molding. Based on the wax-based binder for the gas-atomized spherical 316L stainless steel powders with an average size of 10 μm, different powder-loading feedstocks are prepared, and the effects of vibration frequency and amplitude on the melt rheological properties and phase isolation are dis- cussed. Experimental results show that vibration force field helps to improve the rheological properties of melt powders and lengthen the flow length when the feedstock fills the Archimedes helical mold ; and that the variations of vibration frequency and amplitude can ameliorate the phase isolation of samples, especially at a vibration frequency of 10Hz and an amplitude of 0. 10mm.