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In the lately released Chinese mobile multimedia broadcasting standard CMMB, cyclic-prefix based OFDM technique has been adopted. Traditional timing synchronization for this system requires a correlator to correlate the last Ng samples of the received OFDM symbol with their copies ahead, and at least N (the length of OFDM symbol) data and Ng correlation results have to be stored for implementation, which results in large consumption of memory. In this paper, a low complexity scheme for the joint synchronization of symbol timing and fractional carrier frequency is proposed. This scheme extremely lowers the hardware cost, especially the memory consumption. Simulation results show that the performance of this algorithm can also meet the need of the system well over both AWGN and typical CMMB multipath channel.