系统抽样亦称“机械抽样”和“等距抽样”，是众多抽样方法中的一种。它是将全及总体单位按某标志顺序排列，然后按一定间隔来抽取样本单位。这种抽样具有样本量小、抽样精度高的优点，因而在世界各国抽样调查中应用得最多、最广。这几年，随着我国统计工作改革步伐的加快，统? System sampling, also known as “mechanical sampling” and “isometric sampling”, is one of a number of sampling methods. It is the whole and the overall unit according to the order of a flag, and then at intervals to extract sample units. This kind of sampling has the advantages of small sample size and high sampling precision, so it has been applied most widely and widely in sampling surveys of all countries in the world. In recent years, with the acceleration of the reform of statistical work in our country,