The competition effect for stimulated vibrational and rotational Raman scattering in H2 at various polarization of pump laser and pressure of H2 gas is investigated in this paper. With 5 atm of H2 gas Raman cell and 532 nm elliptically polarized lasor light, for which the compressibility of ellipse is between tg26° and tg32°, more than 60 stimulated Raman lines involving Q(l) and S(1) transitions are obtained. And under low pressure of H2 gas, SRS of R(1) transition pumped by a linear or nearly linear polarization beam, which has not been reported so far, is obsefved.