Abstract: Based on the multi-code CDMA (code division multiple access) and ALOHA techniques, a multi-code CDMA ALOHA system to support multi-rate data services was proposed. The throughput performance of the proposed system under an additive white Gaussian noise (AWGN) channel was analyzed and simulated. The results show that the proposed system can support multi- rate data traffics and has a satisfactory throughput performance because of combining the advantages of multi-code CDMA and ALOHA protocol.