A hybrid cascaded phosphosilicate fiber Raman laser (RFL) with output wavelength of 1270 nm is proposed. By using 1330 cm-1 and 197 cm-1 Raman shift of phosphosilicate fiber, the laser of 1064 nm is shifted to 1270 nm. Symmetric and asymmetric cavity structure are designed for the second-order Stokes Raman light. The comparative experimental results show that the asymmetric structure can reduce oscillation threshold, improve conversion efficiency and avoid the optical leakage from the cavity in the high reflection end effectively. The oscillation threshold of asymmetric phosphosilicate RFL is 3.70 W, the maximum total output power is 2.38 W with the pump power of 8.66 W, the conversion efficiency from 1064 nm to 1270 nm is 22%.