Abstract: We were concerned with the semi-varying coefficient hererocedastic errors in variables,with the errors consisting of the exogenous variable functions and the i.i.d.variables.Specifically,we constructed an empirical likelihood ratio statistic for the parametric coefficient and proved the statistic to be asymptotically standard chi-squared distributed in view of the cases that the exogenous variable function was known or unknown.Thus the nonparametric Wilks phenomenon was derived.