It is difficult to accumulate a large number of data with high quality in operational risk.Naive Bayes classifier is the one of best classifiers used to small data set classification.

• 摘要 操作风险数据积累比较困难，而且往往不完整，朴素贝叶斯分类器是目前进行小样本分类最优秀的分类器之一，适合于操作风险等级预测。