目的　探讨机械性肠梗阻的病因变化。方法　回顾分析我院 1982～ 2 0 0 0年收治的肠梗阻 86 6例。结果　机械性肠梗阻 82 1例 ,占 94.8% ,动力性肠梗阻 45例 ,占 5 .2 %。1982～ 1986年居前 5位的病因是 :疝、肠粘连、肠套叠、蛔虫、肠扭转。 1987～ 1991年居前 5位的病因是 :肠粘连、肠套叠、疝、肠扭转、肿瘤。 1992～ 1996年居前 5位的病因是 :肠粘连、肿瘤、疝、肠套叠、肠扭转。1997～ 2 0 0 0年居前 5位的病因是 :肠粘连、肿瘤、疝、肠套叠、肠扭转。结论　机械性肠梗阻的病因已经发生了很大的变化 ,80年代以疝、肠粘连为主 ,90年代则以肠粘连和肠道肿瘤为主。不难看出肿瘤在肠梗阻的发病因素中占了相当高的比例 ,且有不断上升的趋势 Objective To investigate the etiological changes of mechanical intestinal obstruction. Methods Retrospective analysis of 866 cases of intestinal obstruction admitted to our hospital from 1982 to 2000. Results 82 cases of mechanical intestinal obstruction, accounting for 94.8%, 45 cases of dynamic intestinal obstruction, accounting for 5.2%. The top 5 causes in 1982 ~ 1986 were: hernia, intestinal adhesion, intussusception, roundworm, intestinal torsion. From 1987 to 1991 the top five causes are: intestinal adhesion, intussusception, hernia, intestinal torsion, tumor. From 1992 to 1996, the top five causes were: intestinal adhesion, tumor, hernia, intussusception, intestinal torsion. Among the top 5 patients from 1997 to 2000, the causes were intestinal adhesion, tumor, hernia, intussusception, and intestinal torsion. Conclusion The cause of mechanical intestinal obstruction has undergone great changes. In the 1980s, hernia and intestinal adhesion were predominant. In the 1990s, intestinal adhesion and intestinal tumors were the major components. It is not difficult to see the tumor in the incidence of intestinal obstruction accounted for a very high proportion of factors, and there is a rising trend