  Let $ K $ be a global function field of characteristic $ 2 $. For each
non-trivial place $ v $ of $ K $, let $ K_{v} $ be the completion of $ K $ at $
v $. We show that if two non-degenerate quadratic forms are similar over every
$ K_{v} $, then they are similar over $ K $. This provides an analogue of the
version for characteristic not $ 2 $ previously obtained by T.Ono.
