second, aiming at the particularity of money laundering in finance domain, we prove that preprocessing data with domain knowledge can make data mining more effective . we also propose a set of statistical method to preprocess data in financial field . the experiments we did proved them right 其次,针对金融领域中挖掘洗钱模式的特殊性,论述了如何将金融领域知识应用于数据预处理中以提高数据挖掘的效率和准确性,并结合统计学理论提出了一套针对金融领域中反洗钱的数据预处理方法。