This paper researches synchronization in DVB-T OFDM transmission system and presents a method for it. The method exploits the cyclic prefix inserted between OFDM symbols in time domain to perform the joint estimation of coarse symbol synchronization and the fraction value of carrier frequency offset. After FFT

in frequency domain using continual pilots

the integer value will be estimated

and using scattered pilots to get the CIR

fine symbol synchronization is finished. Simulations show that the performance for the AWGN channel is optimal and it can be well applied to slow fading Rayleigh channel..