Abstarct: In this thesis, the viscosity of liquid alkaline mextals including cesium and rubidium was calculated in a wide range of temperature and density. In this work, the direct correlation function of the fluid was calculated using the mean spherical approximation theory with the square-well potential baxsed an the pair addiritity appronimation in each temperature and density. This was applied to calculate the structure factor in different thermodynamic regions. The radial distribution function at the contact point (molecular diameter) using the linear was abtained isothermal reyularity for cesium at a temperature range of 1000 – 500 K, and in a density range of 10. 990 – 13.712 molL-1, and for rubidium in the range of 1600-500 K and 10.462 to 17.277molL-1. The results obtained showed that in all studied states, the radial distribution function decreases with decreasing of density and temperature increasigof. An effective molecular diameter was assumed for calculation the well Potential width parameter is also considered effectively, which can be calculated at any temperature and density. The diffusion coefficient of alkali mextals at any temperature and density was calculated using the Einstein equation, the results obtained showed that the diffusion coefficient increases with increasing temperature and decreases withe density. For diffusiin coeffciens the values obtained were compared with the available experimental data, in which showed a good process. Fethe more, the viscosity of cesium and rubidium liquids was investigated in different thermodynamic regions whit proposed method. The results obtained were compared with the available experimental data, in which revealed a good process.