The vales of Wo and Fs components were read along isotherms on the quadrilateral diagram of pyroxene at 1 atom presented by Lindsley (1983), fifty points for each OPx and CPx region. Regression equations of temperature for CPx and OPx are determined. In order to determine Wo and Fs components of CPx, correction for kosmochlor (NaCrSi2O6) is also proposed.