Abstract: The design of multi-radio access selection simply according to the number of accessed users and the system capacity(MRAS) is not accurate for the wireless packet networks. A novel multi-radio access selection algorithm in heterogeneous wireless packet networks is proposed, in which the effect of link adaptive technology (including MAC retransmission and adaptive modulation) is considered together with the requirement of quality of packet service, in order to evaluate the resource requirement of packet service and network load status. The dynamic simulation is implemented to evaluate the performance of the proposed algorithm compared with traditional minimum accessed user and minimum path loss MRAS schemes,. The results reveal that the proposed MRAS algorithm performs better than those schemes in terms of QoS guarantee and load balancing.