Abstarct: In this thesis, the diffusion coefficient and surface tension of liquid alkali mextals including cesium and rubidium were calculated in a wide range of temperature and density. In this project, the direct correlation function was calculated using the mean spherical approximation (MSA) and employing the square-well potential model for pair interaction 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) was obtained using the linear isothermal regularity (LIR) in each temperature and density and so investigated its temperature and density dependencies. In this work, the molecular diameter was considered to be effective and its temperature dependency was calculated. We have predicted the behavior of diffusion coefficient and surface tension for the liquids cesium and rubidium in wide range of thermodynamic states. The result obtained was compared with available experimental data which showing a good agreement. Density and temperature dependencies of liquid surface tension was presented as a correlation relation which showing a good agreement between the order of magnitude and sign of the coefficients with experimental values. Furthermore, this method was applied to predict viscosity of Cs and Rb liquids which indicating a reasonable result in compared with their experimental values.