通过模拟分析计算网架吊装过程吊装点和网架的受力、验算起重拔杆主要部件的承载能力 ,得出导致网架坠落的直接原因是拔杆吊钩承载力不能满足要求 ,吊装过程中违反安全操作规程是造成人员伤亡的重要原因 Through the simulation analysis, the force of the hoisting point and the grid of the hoisting process are calculated and the bearing capacity of the main parts of the hoisting rod is checked. The direct cause of the falling of the grid is that the bearing capacity of the hoisting hook can not meet the requirements. Violation of safe operating procedures is an important cause of casualties