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Abstract: Cu2FeSnS4 nanocrystals were rapidly fabricated by ultrasound-assisted microwave irradiation using thioacetamide as a sulfur source. The phase structure, shape and composition of Cu2FeSnS4 nanocrystals were investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and energy dispersive spectrometer (EDS), respectively. The results showed that the phase of as-obtained Cu2FeSnS4 nanocrystals was stannite and the average size was about 5nm. UV–vis absorption spectrum showed that the band gap of Cu2FeSnS4 nanocrystals was about 1.35eV. [Copyright &y& Elsevier]