With the rapid development of aviation transportation,the traffic density increases gradually,the airport runway and taxiway system becomes complex.Aviation safety problems stand out.Among them the runway incursion is an important aspect.There are many causes of runway intrusion,this paper focuses on human factors affecting the runway incursion severity classification.Based on the runway incursion severity classification,the writer adopts multi-attribute risk assessment model to quantify the runway incursion severity classification.And try to illustrate the feasibility of this method in quantification of runway incursion severity classification through examples.Finally,the writer points out the problems in practical work through analyzing obtained data.