Abstract: The elasticity modulus of steel will decrease with the rise of temperature due to fire,and it's much easier to have global buckling phenomenon for reticulated shells.In order to obtain elasto-plastic stability bearing capacity calculation method for signle-layer reticulated shells,FEA principles for calculating single-layer reticulated shells under fire conditions were discussed,and then,large numbers of numerical simulation models were established to give systematic analysis on the two typical cases which include global non-uniform temperature distribution and localized high temperature for K8 type shells.The calculation formula for calculating elasto-plastic bearing capacity for K8 single-layer reticulated shells is obtained.