  We investigate the renormalization of N=2 SUSY L-G models with central charge
$c=3p/(2+p)$ perturbed by an almost marginal chiral operator. We calculate the
renormalization of the chiral fields up to $gg{^*}$ order and of nonchiral
fields up to $g(g^{*})$ order. We propose a formulation of the
nonrenormalization theorem and show that it holds in the lowest nontrivial
order. It turns out that, in this approximation, the chiral fields can not get
renormalized $\Phi^{k}=\Phi^{k}_{0}$. The $\beta$ function then remains
unchanged $\beta=\epsilon gr$.
