  In this paper we mainly study the derivations for even part of the
finite-dimensional odd Hamiltonian superalgebra $HO$ over a field of prime
characteristic. We first give the generator set of $HO_{\bar{0}}.$ Then we
determine the homogeneous derivationsfrom $HO_{\bar{0}}$ into $W_{\bar{0}},$
the even part of the generalized Witt superalgebra $W$. Finally, wedetermine
the derivation algebra and outer derivation algebra of $HO_{\bar{0}}.$
