Abstract: Based on the experiment results of 18 Q690 axial compression welded steel tubes，the overall stability bearing capacity of the high strength steel tube with different slenderness ratios was studied． On the basis of the experimental study，the analysis program was compiled by the inverse calculation segment length method and thus the stability coefficient formula was put forward． The analytical comparisons of numerically calculated values， experimental values and the values by Code of Design for Steel Structure ( GB 50017—2003 ) indicated that the calculated curve of the stability coefficient- slenderness ratio was reasonable，which could be used in the overall stability design of the axial compressive high strength steel members．