We　compare　the　stimulated　Raman　scattering　(SRS)　performance　of　a-cut　and　c-cut　YVO4　in　a　single-pass　Raman　experiment.　The　undoped　YVO4　crystal　shows　its　good　SRS　capability　in　a　quasi-transient　field.　The　non-axial　scattering　angles　of　Raman　radiation　are　also　studied,　and　the　result　is　in　good　agreement　with　the　physical　model　based　on　the　phase　matching　condition.　High-order　Raman　Stokes　and　anti-Stokes　lights　with　good　beam　quality　are　obtained　by　means　of　Raman　amplification.　Our　experiments　show　that　Raman　amplification　is　a　practical　way　to　avoid　unexpected　nonlinear　effects　and　to　obtain　new　wavelength　picosecond　lasers.