The combined iodine content of amylose and its percentage content in some cereal of Henan Province have been determined with potentiometry. Based on both second differential method and Lansky method, a method of improvement on potentiometric titration of determination of amylose is developed in this paper. 本文使用电位滴定法测定了河南省若干种粮食中直链淀粉的碘结合量及百分含量,并在二次微商法和Lansky法(B法)的基础上提出了一种改进法。