Objective Learning about the surveillance of Acute Flaccid Paralysis (AFP) in Zhao tong City in the past 20 years to identify problems, improve working methods and provide a theoretical basis to keep the citizens polio-free. Methods Analyzing statistically the results of surveillance in the polio laboratory and active surveillance in 11 counties and districts of Zhao tong city. Result 740 cases reported;reported incidence over 1/100 000 except 1993, 1994;the not-immunized and the unknown respectively accounting for 11.89%and 12.3%;29 vaccine-related cases reported, accounting for 3.92%;years of failing reaching the sensitive rate of qualified specimens collection, specimens’ timely delivery, and cases’ timely follow-up respectively accounted for 30%, 30% and 50%. Conclusion AFP surveillance fails maintaining a high degree of sensitivity, mainly ascribed to the poor inter-departmental coordination and the crew’s stupefied and mechanical quality. There exist an amount of not immunized people. Transient children remains as the major issue. The control of vaccine-related cases should be paid more attentions on.% 目的 了解昭通市20年来急性弛缓性麻痹(AFP)监测情况，发现问题，改进工作方法，为保持该市无脊灰工作提供理论依据.方法 对昭通市11县区AFP主动监测相关资料以及脊灰实验室监测结果等进行统计分析.结果 共报告病例740例，报告发病率除1993、1994年外均达到1/10万以上；无免疫史和免疫史不详的分别占11.89%和12.3%；报告疫苗相关病例29例，占3.92%；合格标本采集率、标本及时送达率、病例及时随访率未达到敏感指标的年份分别占30%、30%、50%.结论 该市AFP监测不能保持高度敏感性，主要是部门间的协调和工作人员思想麻痹.疫苗免疫存在空白人群，流动儿童免疫仍然是工作的重点.对疫苗相关病例的控制不能忽视.
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