Morphological characteristics of hemocytes from asellus Asellus hilgendorfii（Asellota, Isopoda）were examined by light microscopy. Two types of hemocytes, chromophobic granulocytes (CG) and eosinophilic granulocytes (EG), were observed in the hemolymph of the asellus. The former had chromophobic granules（round to oval, ≦1.0 μm), and the latter had eosinophilic granules（round to oval, ≦1.0 μm). The composition of hemocytes（CG and EG）and morphology of granules（shape and size）of both granulocytes（in the asellus）were similar to those of decapods such as Caridea (Caridina, Macrobrachium, Palaemon, Alpheus）and Stenopodidea（Stenopus hispidus), but differed from those of isopods such as Oniscidea（Ligia exotica, Armadillidium vulgare).