According to the accidents or incidents all around the world , during the approach period , the crew afford most conscious but less time , more complicated situations and tasks .So the approach period could be the most dan-gerous one that we must pay more attention on it .More than a half accidents or incidents have happened when the ILS has failure .A manage system was put forward based on Petri net and A318/A319/A320/A321 Flight Crew Operating Manual.The relevant accident cause factors were statistically analyzed , and the various risks were calcaluted, then the satas were feedback to the manage system to train and manage the crew .%据世界民航所发生的飞行事故情况看，进近着陆阶段时间短、任务重、环境复杂，是飞行事故多发阶段，占很大的比重，因此进近着陆是保证飞行安全的重要阶段。大多数事故是发生在仪表着陆系统出现故障的非精密进近方式。以机组非精密进近的主要飞行操作为基础建立基于Pe-tri网的事故致因模型，统计分析相关的致因因素，计算相关风险值，通过对数据的分析反馈，形成对相应飞行员的针对性学习及训练的系统性管理模式。
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