In this paper the Multichannel Quantum Deffect Theory (MQDT) has been applied to the calculation of the 2s-2p electron impact excitation cross sections and rate coefficients of Lithium like ions Al10+, Si11+ through the available spectral data of the Beryllium-like ions.The results are compared with Mewe'S values which are obtained by using interpolation formulae for the electron impact excitation of the Lithium-like ions. It is found that our calculated values agree within 5% with the Mewe's interpolation results.