The microwave-assisted hydrothermal synthesis of Bi 2S 3 na~no~rods was reported. The result showed that microwave irradiation can help to produce Bi 2S 3 nanorods in very short time. There is a negative feedback effect which increases the degree of crystallinity in the reaction. The microwave-assisted hydrothermal synthesis of Bi 2S 3 na ~ no ~ rods was reported. The result showed that microwave irradiation can help to produce Bi 2S 3 nanorods in very short time. There is a negative feedback effect which increases the degree of crystallinity in the reaction.