i want to upload xml form to my kobo project, i think it is not possible? if possible please help me have to upload xml to kobo?
You cannot upload XML XForms files into Kobo. KoboToolbox is basically an XLSForm-based toolkit; you can export an XML from Kobo, but that is only by virtue of the fact Kobo includes the pyxform translator for this purpose.
In terms of importing an existing form into Kobo, unfortunately it must be in XSLForm format [and no, AFAIK there is no generally available tool to convert an arbitrary XML XForm into its equivalent XLSForm; you'd have to translate it yourself].