A simple gas sensing test paper which can be directly made on paper is reported. Multi-walled carbon nanotubes（ MWCNTs） are rubbed on paper is reported

which left is sensing layer of sensor. Sensors are made using this method on different types of papers

performance of gas sensing are compared. Result shows that porousness and rough surface of filter paper can facilitate sensitive layer to absorb and release gas molecules

and it makes gas sensor completely recover at room temperature. This kind of sensors have good repeatability and stability for gas sensing. The gas sensing test paper

which is prepared rapidly

can be further used for development and detection of volatile organic compounds（ VOCs）.