In view of the heavy oil reservoir，amphiphilic polymer（ICJN）oil displacement agent system，which was suitable for heavy oil exploitation，was designed and synthesized. By scanning electron microscopy（SEM），fluorescence microscope，spinning drop interfacial tensiometer，contact angle meter，quartz crystal micro balances and micro displacement model，aggregation structure of ICJN in solution and the effect of ICJN on the heavy oil emulsification，dispersion ability and the viscosity reduction and oil displacement properties were studied. The results showed that the ICJN solution with the concentration of 1000 mg/L could reduce the oil-water interfacial tension to the magnitude order of 10^-1 mN/m. The viscosity increasing ability of ICJN was higher than that of the common HPAM with hydrolysis degree of 25% and the viscosity-average molecular weight of 1800×10⁴. When the volume ratio of the crude oil and water was 1∶1，1200 mg/L ICJN solutions could make the viscosity of the mixed oil and water system drop to below 100 mPa·s，meaning that the viscosity reduction rate was more than 95%. Using asphaltene to simulate the heavy components of crude oil and 1200 mg/L ICJN solution as mobile phase，the asphaltene adsorption in the surface of SiO₂ chip，decreased from 489.2 ng/cm² to 207.4 ng/cm² and the adsorption layer thickness deceased from 4.7 nm to 3.1 nm after desorption for 40 min，which indicated that ICJN had strong oil sweep ability. ICJN solution displaced the crude oil not only through expanding the sweep volume displacement，but also by emulsifying dispersion crude oil due to low oil-water interfacial tension. Experimental results of microdisplacement showed that the oil displacement effect of 1000 mg/L ICJN system was significantly better than that of 1000 mg/L HPAM system and that of 1000 mg/L HPAM+3000 mg/LAOS system.