Thank you for all the help guys. I have just noticed the Chinese characters were screwed up during FORM submit encoding where "【" should be 12304 when encoded but it become splited into 3 parts: 227,128,144. For the moment, I yet found out how to join up "227,128,144" into "12304". I have narrowed down to FORM URI Safe encoding causes this. My current test codes become too messy to post here. If anyone got any idea, I would be really appreciate if could point out the most possible cause of this.

For the moment, I use Javascript function to ".charCodeAt" before form submit to make each encoded character look like "【" for "【" then only I can use match string in Perl to extract strings inside "【" and "】".

Incase you guys interested in the JS, here is the code:

function encodeCN(id) {
  var tstr = document.getElementById(id).value;
  var bstr = '';
  for(i=0; i<tstr.length; i++)
  {
    if(tstr.charCodeAt(i)>127)
    {
      bstr += '&#' + tstr.charCodeAt(i) + ';';
    }
    else
    {
      bstr += tstr.charAt(i);
    }
  }
  document.getElementById(id).value = bstr;
}
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