目的研究电环切除术对组织的热损伤及组织学诊断的可信性。方法１２１例电环切除术，其中８９例为病灶电环切除，３２例为病灶电环活检，观察切出标本切缘的热损伤程度及病理学诊断。结果６０３％（７３／１２１）标本的切缘可见不同程度的热损伤改变，表现为碳化和（或）凝固。碳化区位于最外层，较薄；凝固区在碳化区旁，表现为细胞错乱，数层细胞紧密单向性倾斜排列，细胞拉长，着色加深，胞核轻微扭曲增大，染色质模糊不清似烟雾状。细胞膜完整，上皮组织结构完好。热损伤程度与电压、电环钢丝横截面直径及电环移动速度有关。结论电环切除术对组织热损伤少，切出组织可供病理诊断，操作简便，止血好，性能安全，值得推广。 Objective To study the reliability of electrocautery excision for tissue damage and histological diagnosis. Methods 121 cases of electrocautery were resected. Among them, 89 cases were resected by electrocautery and 32 cases were electrocautery by electrocautery. The degree of thermal injury and pathological diagnosis of the incised edge were observed. Results 60.3% (73/121) of the specimens showed varying degrees of thermal injury at the margin, showing carbonation and / or coagulation. The carbonation zone is located at the outermost and thinner layer. The solidification zone is beside the carbonation zone, which is characterized by disorder of cells, tight arrangement of several layers of cells in close unidirectional orientation, elongation of cells, deepening of coloring, slight distortion of nuclei and blurring of chromatin Clear smoke-like. Cell membrane integrity, epithelial tissue structure intact. The degree of thermal damage is related to the voltage, the cross-sectional diameter of the ring and the moving speed of the ring. Conclusion Electric ring excision has less thermal damage to the tissue, and the excised tissue is available for pathological diagnosis. The operation is convenient, the hemostasis is good, and the performance is safe. It is worth to be popularized.