This paper studies the principle of the host information security risk assessment and the method to determine the right of each index’s weight. Because Liao Hui and others proposed network terminal security assessment index system exists index weights unreasonable distribution problem, using Delphi method and AHP calculate each index weight and the weights of total ranking of lowest level indexes relative to the highest lever indexes, identified the indicators which have greatest impact to the assessment objectives and apply it to a host of information security evaluation system. Uses the fuzzy comprehensive evaluation method and combined with examples to prove the index system after improving its weight distribution can be more scientifically reflect the importance of the indexes in the evaluation system and the result of the host information security evaluation is reasonable and comprehensive.