Abstract: Effectiveness of acoustic warfare is very important for the survival of submarines.Factors of acoustic warfare effectiveness are analyzed.A system of effectiveness evaluation is built to deal with problems in modern sea battle.A combined method of the reformed AHP and Delphi is applied to resolve of scale limitation problems and overcome subjectivity in the expert evaluation of the effectiveness.Compared with the traditional AHP,the method is analyzed,showing that the reformed AHP provides an effective method for the acoustic warfare effectiveness evaluation which is more reasonable with scientific bases.