Abstract: amples are taken from 13 kinds of fire-retardant fabrics that are suitable for thermal protective clothing′s outer layer,TPPvalues of the samples were tested through thermal radiation and thermal convective integrated experiments,and mass loss before and after combustion was calculated,then SPSS software was used to analyze the effect of mass loss before and after combustion,thickness and weight of single layer fabric on its TPPvalues.It is concluded that theTPPvalue is almost no influenced by mass loss before and after combustion,but more influenced by fabric thickness and weight.The impact of weight on thermal protective performance is not as significant as thickness.And a simple linear regression equation is developed between TPPvalue and thickness.