Abstract: The method of calculation of saturated liquid density, based on the Hansons method, has been proved theoretically from Haggenmachers equation of state. A critical compressibility has been used as a parameter for dividing the compounds into groups to overcome the defeat of Hansons method. The error of Saturated liquid density, calculated by this method, was within 1%. In this paper, a method for calculation of Saturated vapor densities and mixture liquid densities and a generalized equation of heat of vapolyzation was also given. These results proved that the theorem of corresponding state, could be applied to two phases region.