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In this paper, we demonstrated a room-temperature acetone gas sensor based on tin dioxide (SnO 2 )-reduced graphene oxide (RGO) hybrid composite film. The SnO 2 -RGO composite film sensor was fabricated on PCB substrate with rectangular-ambulatory-plane interdigital microelectrodes by using a facile hydrothermal method. The presence of small-sized SnO 2 nanoparticles on RGO sheets was 10 characterized by SEM, XRD and BET measurement, demonstrating well-structures without irreversible restacking of sheets and agglomeration. The sensing properties of the SnO 2 -RGO hybrid film sensor were investigated by exposing to various concentration of acetone gas at room temperature. It was found that the presented sensor exhibited not only excellent response to acetone gas, but also fast response-recovery time and good repeatability, exhibiting the unique advantages of SnO 2 -RGO hybrid composite as a 15 building block for sensor fabrication. The gas response of the SnO 2 -RGO hybrid composite was about 2-fold higher than that of the pure RGO film, and the possible sensing mechanism was mainly attributed to the high surface area, three-dimensional porous nanostructure and special interactions between RGO sheets and SnO 2 nanoparticles.