In order to study the change of the gas sensitive properties when the p-type and n-type material are composited,CuO,SnO_2 and CuO/SnO_2 composite nanofibers materials mixed by 3 kinds proportion are prepared by using the electrospinning. The morphology,microstructure of the as-prepared materials is characterized by XRD and SEM. At the same time,the sensitivity of the 5 materials to acetone,formaldehyde,methanol,ethanol,toluene and other VOC gases was tested. The results indicate that the response values for...