Abstract: Based on volume sum rule for computing equation of state(EOS) of mixture materials, a physical model is proposed to determine mixture temperature. According to equilibrium conditions of component temperatures and pressures, EOS of mixture is calculated using iterations of pressure and density. To verify and validate proposed temperature model, EOS for mixture with H2 and W is calculated and analyzed, and it is shown that proposed temperature model is reasonable. Then EOSs for the following cases, (i) various concentration of H2 and W mixture, (ii) variable single component with fixed concentration, (iii) different temperature and density range, are presented. These results are useful in research of inertial confined fusion and high velocity collision.