  Let $\Gamma_n$ denote the $n$-th level Sierpi\'nski graph of the Sierpi\'nski
gasket $K$. We consider, for any given conductance $(a_0, b_0, c_0)$ on
$\Gamma_0$, the Dirchlet form ${\mathcal E}$ on $K$ obtained from a recursive
construction of compatible sequence of conductances $(a_n, b_n, c_n)$ on
$\Gamma_n, n\geq 0$. We prove that there is a dichotomy situation: either $a_0=
b_0 =c_0$ and ${\mathcal E}$ is the standard Dirichlet form, or $a_0 >b_0 =c_0$
(or the two symmetric alternatives), and ${\mathcal E}$ is a non-self-similar
Dirichlet form independent of $a_0, b_0$. The second situation has also been
studied in [Hattori et al 1994][Hambley et al 2002] as a one-dimensional
asymptotic diffusion process on the Sierpi\'nski gasket. For the spectral
property, we give a sharp estimate of the eigenvalue distribution of the
associated Laplacian, which improves a similar result in [Hambley et al 2002].
