Abstract: This paper introduces a new type thickner NG - -AM/DMDAAC/AA ternary polymeric compound applicable for acidizing technology for carbonate reservoir, and made evaluation on its acidizing fluid performance. This thickner has the advantages of good thickening effect, strong anti - shearing capability, good thermal stability, good compatibility with various acidizing fluid additive, and good anti - salt capability. The compared test with other similar products CT1 - 6 shows that thickner NG has the same performance with other domestic products and has better application prospect