Abstract: In order to study the relationship of structures and properties of cellulose ether polymers-CMC,they were analyzed using chemical titration,（）¹H-NMR, FTIR and other testing methods.The results indicated that the distribution of the group —CH₂COO^-at C₂,C₃ and C₆ within the anhydroglucose unit（AGU） of the new product PAC produced in the mixed solvent of high scale concentration,being more homogenous than the product produced through ordinary procedures.The properties of salt resistance,acid fastness and compatibleness were better.