Choline chloride, as a feed additive for poultry and livestock, is a synthetic chemical product with corncob as the carrier. It can stimulate the ovaries to produce more eggs, litter and gain weight of poultry, livestock and fish. Accurately detect the actual content of choline chloride to ensure that such products meet the requirements of laws, regulations and standards of import regions. At present, the detection methods of choline chloride content mainly include Rayleigh salt method,  non-aqueous  titration  method,  ion  chromatography  method,  etc. Among them , the  ion  chromatography method has the highest accuracy, and the evaluation of the uncertainty of the detection of choline chloride content by ion chromatography method is an indispensable important link for accurate measurement of choline chloride content.