In the present work, cone calorimetric technique has been widely used to study the flammability of polymer. But there are few reports about the cone calorimetric technique exploited for textile. The flammability of cotton fabrics selected in this study was tested by cone calorimeter. The factors, such as fabric layers, heat flux, whether subjoining grid, were discussed and the repeatability of cone calorimetric data was analyzed. In addition, Attempts had been made to establish the suitable methods for measuring the flammability of textiles by cone calorimeter.