SrFe(12)O(19)/Ni(0.5)Zn(0.5)Fe(2)O(4) composite ferrite nanofibers of diameters about 100 nm with mass ratio 1:1 have been prepared by the electrospinning and calcination process. The SrFe(12)O(19)/Ni(0.5)Zn(0.5)Fe(2)O(4) composite ferrites are formed after calcined at 700 degrees C for 2 hours. The composite ferrite nanofibers are fabricated from nanosized Ni(0.5)Zn(0.5)Fe(2)O(4) and SrFe(12)O(19) ferrite grains with a uniform phase distribution. The ferrite grain size increases from about 11 to 36 nm for Ni(0.5)Zn(0.5)Fe(2)O(4) and 24 to 56 nm for SrFe(12)O(19) with the calcination temperature increasing from 700 to 1100 degrees C. With the ferrite grain size increasing, the coercivity (H(c)) and remanence (M(r)) for the SrFe(12)O(19)/Ni(0.5)Zn(0.5)Fe(2)O(4) composite ferrite nanofibers initially increase, reaching a maximum value of 118.4 kA/m and 31.5 Am(2)/kg at the grain size about 40 nm (SrFe(12)O(19)) and 24 nm (Ni(0.5)Zn(0.5)Fe(2)O(4)) respectively, and then show a reduction tendency with a further increase of the ferrite grain size. The specific saturation magnetization (M(sh)) of 63.2 Am(2)/kg for the SrFe(12)O(19)/Ni(0.5)Zn(0.5)Fe(2)O(4) composite ferrite nanofibers obtained at 900 degrees C for 2 hours locates between that for the single SrFe(12)O(19) ferrite (48.5 Am(2)/kg) and the single Ni(0.5)Zn(0.5)Fe(2)O(4) ferrite (69.3 Am(2)/kg). In particular, the M(r) value 31.5 Am(2)/kg for the SrFe(12)O(19)/Ni(0.5)Zn(0.5)Fe(2)O(4) composite ferrite nanofibers is much higher than that for the individual SrFe(12)O(19) (25.9 Am(2)/kg) and Ni(0.5)Zn(0.5)Fe(2)O(4) ferrite (11.2 Am(2)/kg). These enhanced magnetic properties for the composite ferrite nanofibers can be attributed to the exchange-coupling interaction in the composite.