Abstract: To put stretch forming latticed structure (SFL) into practice, the paper puts forward two methods which include tensioning group by group and simultaneously tensioning step by step.Based on the effect on structural axial force of upper chord by tensioning method, a detailed analysis of axial force distribution and comparison is carried out by theoretical method basing on ANSYS finite element program.The study shows that method tensioning group by group is feasible program.It is necessary to study the whole forming process of SFL, and it is important to reasonably select structural configuration of middle party of SFL.