The performance of normalized throughput in a hybrid WDMA-OCDMA system is studied. The effect of optical beat noise on the normalized throughput is analyzed. The scheme of BCH channel coding is proposed to improve the performance of a hybrid WDMA-OCDMA system.The analysis result shows that the normalized throughput is a little decreased when traffic load is light, but can improved greatly when traffic load is medium and heavy. Furthermore, the maximum normalized throughput will increase for the BCH-coded hybrid WDMA-OCDMA system.