Abstract: 0.35 mm-thick high-strength non-oriented silicon steel was prepared by the short process of strip casting. The microstructure evolution of the experimental steel and the effect of NiAl precipitation during aging on the properties were analyzed by OM,XRD,EBSD and TEM. The results show that the as-cast strip is coarse columnar grains and uneven equiaxed grains,with λ texture and α texture. The annealed sheet is mainly consisted of medium α*,strong Goss and Cube and γ texture,and the intensity peaks are 3.16,3.68,3.70 and 4.66 respectively.With the increase of aging time,the hardness rapidly increases from 274 HV in the annealed state to 394 HV at the peak aging and then gradually decreases. The high density of NiAl precipitates with an average size of 8-10 nm is obtained by peak aging at 550 ℃for 4 h.The NiAl precipitates can effectively inhibit the movement of dislocations,resulting in significant improvement in yield strength,as high as 889 MPa. Meanwhile,relatively good magnetic properties are obtained with the magnetic induction B₅₀ and the iron loss P_1.0/400 of 1.62 T and 31.4 W/kg,respectively. Therefore,precipitation strengthening based on the NiAl phase can provide a new idea and method for developing high performance high strength non-oriented silicon steel.