This artical inquires into the buckling shape and effective buckling length both in and out of plane for a compression diagonal with rectangle hoop in the steel light roof trusses which are shuttle in shape 摘要探讨了腹杆带有矩形箍的梭形轻型钢屋架受压腹杆平面内和平面外失稳形态、腹杆稳定性计算长度、连接受拉与受压腹杆的矩形箍的作用及其对稳定性的影响。