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To fulfill future airport capacity requirements, the proposed data link has to be a high capacity, high rate data link. Air-ground data link system can be used in orthogonal frequency division multiplexing (OFDM) systems to improve communication quality and capacity. A channel estimation design method for OFDM system by using correlation of pilot sequences has been proposed in this paper. The main point of this algorithm is the autocorrelation of the sequences. This paper presents a method for optimum training sequences design and the channel estimation implementation that follows. By using these training sequences, in frequency domain, we can get the channel frequency response easily; in time domain, we can get the data fading which are between the adjacent pilot training symbols by some means of interpolation. Simulation and implementation results indicates that this method can obtain good system performance and with low complexity.