In the paper, stimulated Eaman scattering (SES) of birefringence fiber is studied in detail. 9-th order Stokes line of SES has been observed. The dependence of threshold and Baman shift on polarization of pumping light are discussed, The transmission loss of pumping light polarization along the direction of major or minor axis of fiber core are measured, SES gain coefficient of birefringence fiber is theoretically calculated with measured threshold.