The characteristics of natural yarns are inconsistent in their mechanical property. The tensile strength of jute yarns is an intricate parameter, which can not be fully described using single value. This necessitates the study of the jute yarn strength distribution and efficient experimental methods for its measurement. Here Weibull model is used to describe the statistical nature of the tensile strength. However, the experimental process widely uses for obtaining the two parameters Weibull model which is described for this experiment. The Weibull modulus of the untreated and NaOH treated jute yarns were determined and it suggests that the treated yarns are better than the untreated yarns. The tensile strength of NaOH treated jute yarns increased to 219.93 MPa compared to the untreated yarns which was 177.32 MPa. For the treated yarns the coefficient value R2 is 0.9829, which indicates good degree of linearity.