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This paper presents a decision directed frequency and clock tracking scheme to improve the spectrum efficiency of burst mode OFDM transmission with frequency selective channel. OFDM divides one broadband channel to parallel narrowband subchannels of different channel characteristics. In this scheme, the subcarriers with better attenuation are selected out to do the decision-directed based clock and frequency tracking. a novel phase error detection method is proposed which keeps the hard decision working well when tracking is performed. Furthermore, Particular algorithm is designed to ensure the carrier frequency offset and sampling frequency offset could be solved out from detected phase error. Simulations illustrate that the new scheme can work well in typical system.