本文对某电厂施工中大型框架坠落事故进行了分析，找出了事故发生的主要原因是起吊用的滑轮片中滑轮发生偏斜，销轴受到过大的轴向力，销轴保险口凸端断裂，滑轮脱落．至使框架坠落；轴套选材不合理，而造成胶合和异常磨损是事故发生的重要原因。针对上述原因采取适当的措施可预防类似事故发生。 This paper analyzes the accidents of large-scale frames falling in the construction of a power plant, and finds that the main cause of the accident is the deflection of the pulleys in the lifting pulleys, the axial force of the pin shaft is too large, and the pin end of the pin shaft is insured. Break, pulley shedding. In order to make the frame fall, the selection of the shaft sleeve is unreasonable, and gluing and abnormal wear are important reasons for the accident. Taking appropriate measures for the above reasons can prevent similar accidents from happening.