Cu 2 ZnSnS 4 (CZTS) is acknowledged as a promising alternative to traditional p-type solar energy absorbers. However, no facile approach using chemical techniques has been reported to the compositing of CZTS with other n-type semiconductors. Here, we reported the synthesis of CZTS@SnO 2 nanocomposites via a simple one-pot solvothermal process. The structures and morphologies of the as-prepared nanocomposites were investigated systematically by X-ray diffraction (XRD) pattern, scanning electron microscopy (SEM) and high resolution transmission electron microscope (HR-TEM), etc. An in situ growth mechanism was proposed to explain the formation of CZTS@SnO 2 nanocomposites based on the experimental results. The as-prepared CZTS@SnO 2 nanocomposites exhibit enhanced photo-response, which could be attributed to the special structures with improved separation of photo-induced charge carriers.