The k-ary n-cube is a popular interconnection network for many multiprocessor systems because of its good topological structure. In this paper, we investigated the relationship between the fault diagnosability of k-ary n-cube with missing edges and its minimum degree of vertices. Let G be a k-ary n-cube with missing edges and the minimum degree delta(G) = r. Then we show that the diagnosability of G is r for r >= 3, n >= 2 under the PMC model and BGM model. [GRAPHICS] .