Abstract: In this research, the electron energy distribution function of electrons in plasma discharge is studied for CF4-He gas mixtures. The Boltzmann equation was solved by using Fortran computer program. The Boltzmann transport equation was solved by using two-terms approximation for pure gases and mixtures. This method of solution is used to calculate the electron energy distribution function and electric transport parameters were evaluated in the range of E/N varying from 1H10-17#E/N#5H10-15 V.cm2. The electron energy distribution function of CF4-He gas mixture is nearly of Maxwellian distribution at 1, 2 Td and when E/N$5 Td the distribution function is non Maxwellian. Also, the mixtures are have different energy values depended on transport energy between electron and molecule through the collisions.