In order to satisfy the technical demands of high temperature and salinity reservoirs，the physical properties of a novel polysaccharide polymer（SH-1），including rheology，thickening ability，salinity and thermal tolerance，and flow behavior in porous media，were systematically investigated，and the potential of the SH-1 in enhanced oil recovery（EOR）was evaluated. The experimental results indicated that SH-1 had a superior thickening power compared to polyacrylamide（HPAM）with the relative molecular weight of 8000×104 and hydrolysis degree of 5%，the viscosity of 0.1% SH-1 solution was as much as that of 0.5% HPAM solution，being approximately 100 mPa·s（25℃，10 s^-1）. With the salinity increasing，the viscosity of 0.5% HPAM solution significantly decreased；while it was negligible for 0.1% SH-1 solution，suggesting that the SH-1 had the advanced salt tolerance. With the increase of the temperature，the viscosity of HPAM solution was found to steeply drop，on the contrary，a very slow declining was observed for SH-1 solution，proving its good thermal stability. Under high shear rate，the viscosity loss of SH-1 solution was noticeably smaller than that of HPAM solution，at the shear rate of 20 mL/min，the viscosity loss of HPAM solution was 65%，while in the case of SH-1 this value was only 12%. Meanwhile，the appropriate injectivity and mobility control capability were also confirmed. However，the magnitude of polymer retention of SH-1 was higher than that of HPAM due to the rigidity of polysaccharide polymer chain. It is supposed that SH-1 is very promising for high permeability reservoirs with high temperature and high salinity.