This thesis researching on the influence of Fe-25Cr-12Co fabricated by directional solidification under different drawing speed, the microstructure and magnetic performance of alloy with heat treatment under high magnetic field. The microstructure was characterized by Metallurgical Microscopy and Transmission Electron Microscopy(TEM). The results showed that the increasement of drawing speed of directional solidification is benefit to decrease the precipitation of σ phase, but a drawing speed too high is harmful to the directional regular arrangement of microstructure.Applying magnetic field on annealing treatment is benefit to the formation of long-rod-shaped α₁ particles, and has influence on the remanence and coercivity of alloys.Applying magnetic field has a better effection on improving the magnetic performance than 0T magnetic in parallel direction , but worse effection than 0T magnetic field in perpendiculare direction.