Abstract: Based on the utility temperature elevation empirical formula in large space fire,the nonlinear finite element analysis of the fire performances on a single layer reticulated dome is numerically simulated with the thermal parameters specified in the EUROCODE 3 and the stress-strain relationship allowing for strain-hardening of steel.The temperature fields,displacement properties of the structure and most unfavorable position are studied under local fire.Based on the nonlinear finite element analysis,the results show that most of the ultimate fire-resistant duration are less than 2 h under different local fires;the influence of the fire height is the biggest on the ultimate fire-resistant duration of the structure,and the effect of the fire location is bigger than the area of the fire;and the region between the first ring and the third ring is the most unfavorable position of the single layer reticulated dome under fire.