  Let $\mathcal{L}$ be an algebra generated by the commuting independent nests,
$\mathcal{M}$ is an ultra-weakly closed subalgebra of $\mathbf{B(H)}$ which
contains $alg\mathcal{L}$ and $\phi$ is a norm continuous linear mapping from
$alg\mathcal{L}$ into $\mathcal{M}$. In this paper we will show that a norm
continuous linear derivable mapping at zero point from $Alg\mathcal{L}$ to
$\mathcal{M}$ is a derivation
