Hi,
Who know whay in my document footnote get double numbering?

That depends on what you mean by double numbering. Please explain. Depending on your footnote setup, footnote numbers can restart on every page or in every Section. If this is not what's happening with your document, perhaps you have both footnotes and endnotes, or perhaps the document has some form of corruption.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

I am sorry for poor explanation. My footfote appear twice: [1] 1 insted of once: 1
I had to change the style of the footnote to none. This fixed it problemms.