VB6 is the most unsatisfactory place to do not support the mouse roll. Today, I search online, find a few solutions, I feel good after trying. 1, plug-in way, see the following address http://www.e3i5.com/book/list.asp?id=202, Microsoft Patch http://download.microsoft.com/download/e/f/b/efb39198- 7C59-4ACE-A5C4-8F0F88E00D34 / VB6Mousewheel.exe reference: http://www.kbalertz.com/kb_837910.aspx also provided another way, I haven't tried it yet, I have interested you can try it yourself.