if needs using Designer or Visual studio, can someone give some hints or links to other resources? thanks

Hi , You can create a list / Lib column with "Hyperlink or Picture" type and select "Hyperlink" as a format URL. So when you create a new item it will ask you to add hyperlink , in which you can provide hyperlink of a Infopath document. Hope this helps.Regards, Pratik Vyas | SharePoint Consultant | http://sharepointpratik.blogspot.com/

Thanks, good suggestion, but All information are entered through InfoPath form, I can think of giving a hyperlink value in the form automatically, but if the document library is restructured, the hyperlink will be invalid. Also, my idea is to link to an existing column such as ID, any one could be some idea?