该系统利用BP回馈神经网络算法实现对安全评价样本的学习、测试，能够正确形成安全事故各个影响因子的权重值，并且将样本和评价结果保存在数据库中，通过预测的方法为安全评价提供了一种新的途径。-The system uses neural network BP algorithm back to the safety assessment of the learning sample, test, to correct safety-related incidents affecting the for

BP神经网络，改进后的高等算法它的学习规则是使用最速下降法，通过反向传播来不断调整网络的权值和阈值，使网络的误差平方和最小。- BP neural network algorithm improved its higher learning rule is to use the steepest descent method, through a reverse spread to constantly adjust the network weights and thresholds, s