The effect of phosphate passivation and different inorganic adhesives on properties of Fe-Si-Al powder core was investigated. When the Fe-Si-Al magnetic powder core is made from the powder passivated in 0.4 wt% phosphoric acid solution, coated with 0.9 wt% of low melting point glass powder, compacted under 1980 MPa and annealed at 700 oC for 1 h in N2 atmosphere, it presents the optimum magnetic properties. Its effective permeability is 125.98, the total core loss is 316.7 mW/cm3 (f=50 kHz, Bm=100 mT). Besides, tensile strength of the core is 261 N. Meanwhile, it improves the anti-aging ability of Fe-Si-Al powder core during using