In this article, the percolation threshold for tensile strength of polymer/CNT nanocomposites (PCNT) is studied by known Pukanszky model. Since the network of nanoparticles forms at very low concentration of CNT, the filler network shows strengthening efficiency in PCNT beside the interphase regions surrounding nanoparticles. The Pukanszlcy model is developed by the properties of network such as density (N) and strength (sigma(N)). The suggested equations are applied in some samples and the results are explained. Also, the effects of several parameters such as "N", "sigma(N)" and percolation volume fraction (phi(p)) on the strength of PCNT are plotted based on the developed model. The direct influences of "N" and "sigma(N)" as well as the inverse effect of "phi(p)" on the tensile strength of PCNT are displayed. The "sigma(N)" parameter only changes the strength of PCNT at low "phi(p)", which shows the important role of percolation level. (C) 2017 Elsevier B.V. All rights reserved.