不要自己做Arff文件，麻烦，你做成.csv，让weka自己另存为就行了。 文本文件打开，把字段名复制到第一段，保存成.csv 举个例子： @RELATION cars @ATTRIBUTE buying REAL @ATTRIBUTE maint REAL @ATTRIBUTE doors REAL @ATTRIBUTE persons REAL @ATTRIBUTE lug-boot REAL @ATTRIBUTE safety REAL @ATTRIBUTE class {unacc,acc,good,v-good} @DATA vhigh,vhigh,2,2,small,low,unacc vhigh,vhigh,2,2,small,med,unacc vhigh,vhigh,2,2,small,high,unacc vhigh,vhigh,2,2,med,low,unacc vhigh,vhigh,2,2,med,med,unacc vhigh,vhigh,2,2,med,high,unacc vhigh,vhigh,2,2,big,low,unacc vhigh,vhigh,2,2,big,med,unacc 然后用Weka打开就可以了。