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相比不放回抽样，放回抽样的实施比较简单，操作性强，但缺点在于单元可能被重复抽到，抽出的有效样本量小于等于样本量，不是固定的。本文应用逆抽样的原理，设计了一种放回抽样方法，满足有效样本量固定，并且估计量的性质优良。“,”Conducting sampling with replacement is more simple, but its disadvantage is the units may be sampled repeatedly and the available sample size is random. The paper proposes a new method of sampling with replacement applied by the principle of inverse sampling, which makes the sample size is constant and the estimator is fine.