Exospheric neutral and electron temperatures have been estimated for the primitive upper atmosphere and ionosphere with various oxygen content in the scheme of our previous model (Shimizu and shimazaki, 1976>. The expospheric neutral temperature has been shown to be rather insensitive to the change of oxygen content, justifying our previous assumption for the temperature varition, while the exospheric sensitive to the composition change, to be quite sensitive to the compositional change, mainly owing to the strong dependence of electron density on the oxygen concentration.