The burst strength is one of the most important characteristics for nonwovens.The strength of three kinds of the nonwoven were detected under four testing radius,including the wood spunlace nonwoven,the SpunbondMeltblown-Spunbond(SMS)nonwoven and the melt nonwoven.The precise results of the SMS and the melt nonwoven could be received by removing the influence of the elastic membrane and the single-peak fitting.The influence of the testing radius to the strength results was also studied,and the semiempirical formula(q0=k/r3)was deduced using the elastic mechanics theory and testing data.