Abstract: There is a lack of research on how roof elements participate in the work with the space frame together to resist wind suction effect. This paper discussed all kinds of connections of every elements，and then established a finite element analytical model of the integrated structure considering roof elements such as purlin and roof panel. Combined with a practical project，by analysing and comparing the influence on displacements of structure and forces of bars from purlin and roof panel，it could be drawn a conclusion that under wind suction effect，considering the participation of roof elements in the work with space frame together was feasible． At the same time it was also discussed the problem that a special measure should be taken for a cantilevered end．