本文分析了商品油计量纠纷产生的技术原因，从中得出在输油管线上应安装符合ＳＹ－５３１７－８８〈原油管线自动取样法〉标准的自动取样器，如何解决样品的代表性和可靠性，ＤＯＤ－ＹＣ２０００型的原理、主要构成和技术指标给出一个范例。该装置经国家法定计量技术机构检验，完全符合上述标准，为实现科学的、公平的和准确的交易，提供了一个良好的商品原油交接的市场氛围。 This paper analyzes the technical reasons for the measurement dispute of the commodity oil, and draws the conclusion that how to solve the representativeness and reliability of the sample by installing an automatic sampler conforming to SY-5317-88 standard on the oil pipeline, DOD-YC2000-type principle, the main components and technical indicators give an example. The device tested by the national legal metrology technical institutions, in full compliance with the above criteria, in order to achieve a scientific, fair and accurate transactions, provides a good atmosphere for the transfer of crude oil market environment.