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燃气锅炉在长期运行中烟管管端及管板常常产生裂纹，其主要原因是热负荷较大、管板结垢严重、苛性脆化等。本文针对各种裂纹产生的原因并结合工程案例，阐述了管板烟气侧加设隔热层、加强水循环、改善制造工艺、加强水质管理等防止措施，使烟管管端及管板工作条件得到很大改善，以防止裂纹的发生，保证锅炉安全、高效地运行。“,”The smoke tube end and tube plate often generate cracks during the long-term operating of gas boiler, the main reason of which is big thermal loading, serious scaling of tube plate, caustic embrittlement, etc. Aimed at the causes of various cracks, and combining with engineering cases, this paper expounds the prevention measures, such as adding insulation layer to gas side of tube plate, strengthening water cycle, improving manufacturing process and strengthening water quality management, to make the working conditions of smoke tube end and tube plate highly improved so as to prevent the occurrence of cracks and ensure the operating of boiler safely and efifciently.