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The partial potential energy surface was constructed by ab initio method [QCISD(T)/6-311++G(2df,2pd)]for F+CH4→HF+CH3 reaction system. It not only explained the reaction mechanism brought forward by Diego Troya by means of quasiclassical trajectory (QCT) but also successfully validated Kopin Liu's experimental phenomena about the existence of the reactive resonance. The lifetime of the scattering resonance state was about 0.07 ps. All these were in agreement with the experiments.