Abstract: This paper studies a method of using pilot interval to optimize pilot location for IEEE 802.11 OFDM system. We propose a frequency offset estimation and compensation algorithm using pilot sequence which has a better performance. Based on the IEEE 802.11 standard frame format, using the method of numerical simulation method to make performance analysis of the identified position of pilot and frequency offset estimation compensation algorithm. Numerical simulation results show that the proposed method of optimizing pilot location and frequency offset estimation and compensation algorithm, under the condition of without raising system complexity, can significantly improve the system performance.