  In this paper we establish approximation properties of Ces\`{a}ro $%
(C,-\alpha ,-\beta )$ means with $\alpha ,\beta $ $\epsilon $ $(0,1)$ of
Vilenkin-Fourier series.This result allows one to obtain a condition which is
sufficient for the convergence of the means $\sigma _{n,m}^{-\alpha ,-\beta
}(x,y,f)$ to $f(x,y)$ in the $L^{p}-$metric.
