中文摘要：

多QoS约束的组播路由技术是当前实现分布式网络多媒体的关键技术，蚁群算法是解决多QoS约束组播路由问题的一种启发式算法，但存在收敛速度慢等缺陷．基于这种情况提出了一种改进的蚁群算法，该算法采用基于组成员节点驱动的方式构造组播树，并在概率转移函数中添加了方向因子，使蚂蚁在寻找路径时摆脱了最初的盲目性，以更大的概率快速向源节点靠近．仿真实验证明，改进蚁群算法的收敛速度明显提高．

英文摘要：

The multicast routing technology with multi-QoS constraint is the key for distributed multimedia on the network. The ant colony algorithm is one of the best algorithms for solving the multicast routing problem with multi-QoS constraint, but it takes too much time to converge. Therefore, a modified ant colony algorithm was proposed. This new algorithm adopts the gToup-member-node-driven method to create the tree and adds the orientation factor to the probability function, which enables the ant to get rid of the initial blindness when searching paths. The simulation results show that the new algorithm can rapidly converge.