Abstract: Taking difficulty on the exact measurement of NGI （Next Generation Internet）status and the complete expression of the user QoS （Quality of Service）requirement into account, a flexible QoS multicast routing scheme based on FCA （Food Chain Algorithm）is pres

Key words: NGI （Next Generation Internet）,Flexible QoS（Quality of Service）,Multicast routing,FCA（Food Chain algorithm） ,Game theory, Nash equilibrium