The physical conditions of the liquid oxygen lubricating medium was studied among hybrid bearings within high-speed turbine pump and the physical parameters of oxygen medium under single-phase and two-phase flow was acquired. With the certain pressure and temperature in single-phase oxygen medium , the relations between the medium' s density and viscosity along with the pressure and temperature were constructed. Those physical parameters such as density and viscosity was acquired directly through the table. The physical parameter of two-phase medium were calculated by mixture model. As a result of calculation , during the continuous vaporization and final transformation to gas, liquid oxygen' s density continuously declines to 10% of the one in liquid state, while viscosity declines to 20% of the one in liquid state.%研究了高速涡轮泵动静压轴承的液氧润滑介质物性情况,获取了氧介质在单相及两相下的物性参数.研究结果表明:对于单相(液相或气相)氧介质,在一定的压力和温度下可建立其密度和粘度随压力和温度的变化关系或直接查表获得；对于两相氧介质,其物性参数的荻取可以采用两相均质混合模型方法进行计算.计算结果表明在液氧不断汽化并最终转变为气态这一过程中,其密度连续下降为液态时的10％,粘度下降为液态时的20％.
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