Martin-Hou equation of state (1955) can be derived on the basis of statistical mechanics.By modifying the effect of molecular volume and further ap proximation

virial equation of state can be turned into Martin-Hou equation of state.From the derivation it can be seen that Martin-Hou equa tion of state has the same basis in theory as the virial equation of state.As the intera ction between molecules is very complex

Martin-Hou equation of state used the th ermodynamic relations and experimental data to simplify the function of temperature

and obtained good result.The functio n of temperature of M-H equation of state can be derived

which is similar to an alytic forms of viral coefficients

and the physical meanings of parameters are explicit too.In or der to extend the usage of Martin- Hou equation of state

it is of importance to study the theoretical foundation of Martin-Hou equation of state and the phys ical meanings of its coefficients.