Due to high temperature and high salinity in type-Ⅲreservoirs of Shengli oilfield，conventional polyacrylamide oil displacement agent cannot effectively enhance oil recovery. Therefore，a new type of non polyacrylamide supramolecular system with temperature resistance and salt tolerance was developed with self-made supramolecular main agent and assistant agent. And the basic performance，oil displacement efficiency and microscopic accumulation morphology were characterized. The result shows that the supramolecular system can form dense network aggregate like HPAM by self-assembly between small molecules. Under the condition of type-Ⅲreservoirs in Shengli oilfield，the viscosity of the supramolecular system increases by more than one time with mass concentration of 0.1%-0.25% compared with HPAM. Without oxygen re? moval，the viscosity of the supramolecular system keeps stable within 30 days. Single pipe physical simulation may enhance oil recovery by over 18% when the mass concentration of supramolecular system is 0.15%. So the supramolecular system is a very promising new type of oil displacement，suitable for high temperature and high salinity reservoirs in Shengli oilfield.