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在充分利用计划免疫已往信息的基础上，分别采用整群抽样方法与二阶段随机整群抽样方法，进行以乡、以县为单位的接种率调查，在95％可信限与±10％误差条件下，对乡级抽取2～3个行政村，对县级抽取6～8个行政村，即可达到调查目的，用最小的样本容量来反映出客观接种率状态，经现场验证与计算机模拟，结果令人满意．
On the basis of making full use of the past information of EPI, the cluster sampling method and the two-stage random cluster sampling method were respectively used to investigate the coverage rate of townships and counties. The 95% confidence limits and ± 10% error Under the conditions, 2 to 3 administrative villages will be selected from the township level, and 6 to 8 administrative villages will be selected from the county level to achieve the purpose of the investigation. The objective sample coverage rate will be reflected with the smallest sample size. After field verification and computer simulation , The result is satisfactory.