yes.I agree on u.So the issue is strange.Though the text is gbk or utf8,I can configure the characterset zhs16gbk or al32utf8 in control file.

Oh,right,I have missed a important information.when I rename the title of my data text to test.txt,then no matter what the encoding of my data text,the issue will disappear!!!I can import it .So I think there is something unkonown in perl.