This paper presents a gradual argumentation model of evidential reasoning, which is based on a revised semantic of John L. Pollock's critical link semantics. This model is proposed as a new argument graph, which consists of two kinds of links, incorporated in the ASPIC⁺ framework with variable degrees of justification. This model aims to provide a revised computation of justification in argument graphs and to generate a new formalization of standards of proof. This model is thus given as a gradual semantic beyond Dungean semantics, which offers a system for regarding arguments as justified to variable degrees in evidential reasoning.