Over 60 percent of the original oil in a place (OOIP) is retained in a reservoir after conventional methods have been exploited. Application of enhanced oil recovery (EOR) technology gives an additional chance to get out possibly about 20 percent more oil from the reservoir. The use of watersoluble polymers improves the water-oil mobility ratio, therefore, the displacement efficiency increased, and leads to enhanced oil recovery. High-molecular-weight polyacrylamide group is widely and successfully used in EOR. But no commercial polymer composition can be used in conditions of high temperature and hardness brine offshore reservoirs yet. To avoid the time consumption and high expense for selection and synthesis of the appropriate-structural polymer for EOR application, the authors attempt to find additives to enhance the thermal stability of polymer solutions. In this paper, the authors report the results of improved viscosity stability of diluted polymer/ seawater solutions aged at reservoir conditions for 31days by adding graphite-oxide particles (Gas). In the presence of 300 ppm of GOs, the viscosity stability of 1700 ppm acrylamide-based polymer in sea water solution increases from 92 °c to 135°C. FESEM pictures show good distribution of GOs in polymer network, which is a result of integration of functional groups in Gas surfaces and hydrophilic polymer chains.