Abstract:Water quality has great impact on polyacrylamide gel agent by analyzed problem of deep profile control ‘ experiment . The paper analyzed the following factors of water quality: the pH value, the calcium ion,the magnesium ion, the sulfur ion, the suspended material, oil content and the concentration of various ions, and conducted an experiment about their effects on the intension of polyacrylamide gel. The results indicated that: the sulfur ion and suspended material has huge damage on the hardness of gel ; the pH value, calcium ion and magnesium ion has medium impact on the hardness of gel,the content of Oil has negligible effect.