AbstractLet $$\,G/K\,$$
G
/
K
be an irreducible non-compact Hermitian symmetric space and let $$\,D\,$$
D
be a $$\,K$$
K
-invariant domain in $$\,G/K$$
G
/
K
. In this paper we characterize several classes of $$\,K$$
K
-invariant plurisubharmonic functions on $$\,D\,$$
D
in terms of their restrictions to a slice intersecting all $$\,K$$
K
-orbits. As applications we show that $$\,K$$
K
-invariant plurisubharmonic functions on $$\,D\,$$
D
are necessarily continuous and we reproduce the classification of Stein $$\,K$$
K
-invariant domains in $$\,G/K\,$$
G
/
K
obtained by Bedford and Dadok. (J Geom Anal 1:1–17, 1991).