Abstract: In this paper the derivation algebra of Lie algebra Σ of characteristic two is determined. Using this result we obtain the necessary and sufficient condition under that Σ of characteristic two is the restreted Lie algebra. Finally we prove that Σ of characteristic two isn't isomorphic the Lie algebras of characteristic two which are known by authors of this paper. But it still is a filtered deformation of the Lie algebra of H-type i.e. Its associated grated algebra Gr Σ is isomorphic to H(2n + 2.r).

Key words: Derivation algebra, Restreted Lie algebra