In order to obtain high average power and wide spectrum picosecond laser,and al so to reduce the volume of the whole optical system,we study the high power picosecond pumped stimulated Raman scattering (SRS) oscillation cavity theoreticaly and experimentally in this paper.By analyzing th e accompanying processes of SRS,the various nonlinear effects in Raman crystal under high power pumped condition are simplified as SRS under the condition of simple equivalent thermal lens and through the exp erimental measurement divergence angle of single pass of SRS is obtained,from w hich the Raman crystal equivalent lens radius is calculated.On the basis of stable and efficient design theory of SRS oscillation cavity,the excellent performance of the cavity design is verified by the compar ing experiments.The high power picosecond pumped SRS system can produce the maxi mum power of 1.32W,covering 532nm to 698nm laser line,which is the highest av erage power of the picosecond Raman laser up to date.