The particular characters of Trojan are not fully taken into consideration by existed network attack effect evaluation systems which mainly focus on DDoS and Warm.A few Trojan harm measurement systems is somewhat short for objectivity and completeness as the result of that its indicator values is confined to manually marked and qualitative values.Under the circumstances,the analysis of Trojan's features were started from,and a hierarchical index system which accepted both quantitative and qualitative values,and both manually marked and system col-lected values was built.Then,a FAHP based evaluation model was proposed to evaluate the Trojan attack effect.Meanwhile,a many-to-one method to ensemble multiple weight vectors was proposed.Finally,the rationality of proposed evaluation system was verified by comparison with others.