Commodity inspection sampling is based on the sampling methods and sampling tools specified in technical standards or operating procedures. Randomly select a small sample from the entire batch of goods that is representative of the entire batch of goods in terms of quality characteristics. Through the inspection of the sample, the quality of the entire batch of goods is evaluated accordingly. Commodity inspection sampling is also called sampling, formerly known as sample picking and sample picking. There are two commonly used sampling methods for commodity inspection: percentage sampling and count sampling. The principles that must be followed in commodity inspection sampling are: (1) Randomness. The first principle is the principle of randomness, that is, the samples taken from the batch to evaluate the entire batch of goods should be selected according to the random principle without any selection. (2) Representativeness. Sampling is the collection of all individual samples (part samples) taken from the entire batch of goods into a large sample to represent the entire batch. Individual samples (part samples) should not be used to represent the entire batch, because individual samples may be higher or lower, but When enough samples are taken, the average is close to the average quality of the entire batch. Sampling must be sufficiently representative, otherwise even if the most advanced technology and equipment are used during inspection, it is impossible to obtain accurate inspection results, and the quality of the goods will be erroneously assessed. (3) Feasibility. The quantity and method of sampling, as well as the sampling devices and tools used, should be reasonable, feasible, realistic, and in line with the requirements for import and export commodity inspection. It should be fast, economical, and save manpower and material resources on an accurate basis. (4) Advanced nature. Improve sampling technology and sampling standards to reach the international advanced level to meet the requirements of international trade.