Abstarct: Recently many attempts have done for calculation of static structure factor, S(k), of dense fluids. In the present work, we used the hard sphere radial distribution function to calculate the static structure factor for xenon fluid in different thermodynamic states. The evaluation of calculated structure factor for xenon fluid can be present behavior of S(k) in the extensive region of k for those of thermodynamic states with high density. The result of model was not satisfied for thermodynamic states with low density and we can not obtain the correct behavior of S(k) in small-k region. So we used this model for evaluation of structure factor behavior of xenon fluid in wide range of k for high densities. The similar studies for argon fluid yield the same results. Since the model is not appropriate for studying in low densities and low-¬k regions, we must be used other model for calculation of structure factor of xenon fluid in these thermodynamic states. The model that we used for this purpose is baxsed on the definition of direct correlation function which can predict the structure factor behavior of xenon fluid for low densities and in low-¬k region This model can be show the correct behavior of S(k) in low-k. The result shown that the value of S(0) decreases with increasing of temperature far from the critical temperature. Also, we observed that the value of decreases with increasing of density. At the end the results of presented model with results of other models and differences and agreements between these models have compared.