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The optical frequency comb has been widely used in precision measurement.In this study,a multi-peak fitting approach is first proposed to fit the two-photon transition spectrum which overlaps with the neighboring transition in 87 Rb.The multi-peak fitting approach is used to eliminate the frequency shift affected by the neighboring transition.With locking the carrier envelope offset frequency at 1/4 repetition frequency,the transition frequency is measured to be 770569132739.9±5.8 kHz,which agrees well with the previous result recommended by Comité Inteational des Poids et Mesures.