分析了重油催化裂化装置再生器－三旋烟气系统出现大量焊缝开裂的原因，提出了防止产生裂纹的相关对策和对已产生裂纹的几种修复方案，概述了大庆石油化工总厂再生器腐蚀开裂的情况、修复的关键技术及所采取的措施，对同类型设备裂纹的修复有指导意义。 The causes of a large number of weld cracking occurred in the regenerator - tri-cyclone flue gas system of a heavy oil catalytic cracking unit were analyzed. Relevant countermeasures to prevent the occurrence of cracks and several remediation schemes for the crack were put forward. Regenerators of Daqing Petrochemical Complex The situation of corrosion cracking, the key technology of repair and the measures taken are instructive for the repair of cracks in the same kind of equipment.