Abstract: Nanofibers were fabricated by electrospinning a mixture of PVAc and Sn(OH)4 hydrosol in different cosolvent , as in methanol, methanol/ ethanol or acetone. The morphology and interaction of the hybrid nanofibers were characterized by Scanning Electronic Microscope (SEM) and Fourier Transform Infrared spectrum (FTIR) images, respectively. Thermogravimetric analysis(TG) and transmission electron microscope(TEM) were measured to assess the thermal properties of the nanofibrers. The study revealed that the most stable PVAc/SnO2 system is in methanol/ethanol cosolvent, especially 8% PVAc after hybridization owned uniform and smooth nanofibrous morphology. It was shown that hydrogenbonded reaction between PVAc and Sn(OH)4 gel.The thermal property also improved when Sn(OH)4 was involved PVAc solution, and the more stable solution resulted in the higher thermal decomposition temperature which increased almost 150℃.