Chiral properties of QCD formulated with the domain-wall fermion (DWQCD) are studied using the anomalous quark mass ms, and the spectrum of the l-dimensional Wilson-Dirac operator. Numerical simulations are made with the standard plaquette gauge action and a renormalization-group improved gauge action. Results are reported on the density of zero eigenvalue obtained with the accumulation method, and a comparison is made with the results for m(5q).