Abstract: With MY (mean yield) criterion in plastic limit analysis, the burst pressure of a defect-free line pipe was analyzed to obtain an analytical solution. The burst pressure of rolled X80 steel was calculated by this method and compared with those based on Tresca, Mises and TSS yield criteria. The results showed that the burst pressure is a function of the strain hardening exponent n depending on the yield-to-tensile strength ratio ReL/Rm, the original pipe geometry t0/D0 as well as the ultimate tensile strength. The burst pressure decreases with the increase of the strain hardening exponent and increases with the increase of the ratio of thick to diameter and tensile strength. It is also concluded that Tresca criterion predicts a lower bound to the burst pressure, while TSS criterion predicts an upper bound one. However, the burst pressure on the MY criterion lies just between the TSS and Tresca solutions, and the MY criterion almost has the same precision with the Mises solution.