A comp lex decision p rob lem is discu ssed in th is paper. Expert group decision is a one of the effect ive m ethod to reso lve th is p rob lem. A f ter som e qualitat ive p lan s ach ieved by expert group discu ssion, the con sistency of expert group though t can be ach ieved gradually by group con sistency algo rithm s. Du ring the above p rocedu re, ro les of the chairperson is impo rtan t, w ho conduct the expert group to ob tain con sistency, and enhances eff iciency of group decision. The st rategy of m an2 compu ter com b inat ion are ref lect in w ho le p rocedu re of convergence, du ring w h ich the advan tages of bo th m an and compu ter are fu lly u t ilized to so lve comp lex p rob lem.