Carrier frequency and symbol timing errors may greatly degrade the performance of the orthogonal frequency division mulitplexing (OFDM) system, especially in multipath environment, In this paper, wer explore the cyclostationarity of OFDM signals, which only relies on second order statistics, to estimated the synchronization offset, First, a coarse carrier fre-quency offset estimator for multipath environment is developed using the second order statistics of the received OFDM signal. It has a wide capture range though not accurated. Second, we intoduce a new synchronization algorithm based on cyclosta-tionarity and matched filter theories, which can get the macimal estimation SNR in multipath environment, Both estimators uti-lize channel stte information to achieve better estimation per-formanc and are non-pilot aided. They can be combined to form a whole OFDM synchronizer for multipath environment.Finally, simulations confirm the performance of the estimation algorithm.