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This paper analyzed the structure of Orthogonal Frequency Division Multiplex (OFDM) system and presented a new Carrier Frequency Offset (CFO) tracking algorithm, which depends on comparability between the decision data and the original data to correct carrier frequency offset. Therefore it is robust during the normal communization process since the Bit Error Rate (BER) of the decision data is low. We can utilize pilot data in time domain for channel estimation to track CFO without reducing system efficient and to enhance the tracking scope largely. Simulation results denote the presented algorithm can track the frequency offset and control it under ±1% using only 1 frame if the original frequency offset is within ±8%.