Scanning electron microscopy and light microscopy were used to examine the morphology and distribution of antennular sensilla of the Macrobrachium nipponense. The results showed that there is no sexual dimorphism in the morphology and distribution of the antennular sensilla. Each antennule is consisted of two flagella, the medial flagellum and the lateral flagellum on which there is an appendage flagellum. There are four types of sensilla on the flagella of antennules of M. nipponense: aesthetascs, two types of simple setae and denticulated setae. Aesthetascs are located on the appendage flagella of the antennules. The distal part of the aesthetasc is very soft and there is no pore on the tip of the aesthetascs. Other types of setae are located on both the lateral and medial flagella. Type I simple setae are smooth with a pore on the tip. They usually appear in groups with type II or denticulated setae and they are shorter than the type II and the denticulated setae. Type II setae are smooth with scales around tip, with complicated pore structure. There are two different sizes of denticulated setae. The 1/2～1/3 distal portion of the denticulated setae is studded with numerous denticles. Their tips and pore structures are similar to those of type II setae.