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Orthogonal frequency division multiplexing (OFDM) is a promising transmission technique for future wireless communication systems. However, OFDM is very sensitive to carrier frequency offset (CFO). And for an OFDM system with CFO estimation and compensation, the residual CFO will always degrade the system performance. To alleviate this problem, in this paper, a new technique is proposed to estimate and compensate the residual CFO in single OFDM symbol, so as to improve the system performance. Furthermore, since the proposed technique is based on the utilizing of the cycle prefix (CP) in single OFDM symbol, it will not cause additional loss of spectrum efficiency.