The composite nanofibers of xSrSiO(3)/(100 - x)SrFe(12)O(19) (x = 0-13 wt%) with diameters around 110 nm have been prepared by calcination of the electrospun SrSiO(3)/SrFe(12)O(19)/poly (vinyl pyrrolidone) (PVP) composite fibers at 800-900 A degrees C. The composite nanofibers were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. After calcined at 800A degrees the M-type strontium ferrite is formed and the strontium silicate exists as an amorphous state when the calcination temperature below about 950 A degrees C. The addition of SrSiO(3) has an obvious suppression effect on the strontium ferrite grain growth and the ferrite grain size decreases from 66.9 to 33.5 nm corresponding SrSiO(3) content from 0 to 9 wt% in the composite. The specific saturation magnetization (Ms) of the xSrSiO(3)/(100 - x)SrFe(12)O(19) composite nanofibers exhibits a continuous reduction from 58.0 to 45.6 A m(2) kg(-1) with the increase of SrSiO(3) content from 0 to 13 wt%. With addition of SrSiO(3) from 0 to 13 wt%, the coercivity of the composite nanofibers obtained at 900 A degrees C initially increases, reaching a maximum value 501.1 kA m(-1) at the silicate content 7 wt%, and then shows a reduction tendency with the strontium silicate content increase further up to 13 wt%. This influence on the coercivity by strontium silicate can be attributed mainly to the ferrite grain growth suppression and the non-magnetic phase barrier for the domains misalignment.