Orthogonal frequency division multiplexing (OFDM) could efficiently tackle the problem of frequency-selective fading by adopting multiple subcarriers to be transmitted upon different subbands. Subcarriers with weak channel qualities suffer severe symbol errors, which limits the overall system performance. Suppressing subcarriers with bad channel qualities would solve the problem. Here, a joint subcarriers suppression and opportunistic network coding (JSSONC) scheme is proposed for OFDM data broadcasting systems, where subcarriers suppression technique is combined with network coding (NC) technique. By using JSSONC, the base station suppresses the subcarriers being in bad channel conditions. Consequently, retransmission packets used to recover lost packets are produced by adopting network coding to reduce further the number of transmissions. Simulation results show that the proposed JSSONC in OFDM data broadcasting systems reduces the average transmission times of every data package (ATT-E), compared with the traditional OFDM broadcasting systems,thus improving the system transmission efficiency.