 Nanotechnology has been increasingly applied to the field of enhanced oil recovery, EOR. Nanoparticles can be used to improve the performance of existing EOR methods, such as displacing oil, reducing viscosity, preventing asphaltine precipitation, and improving wetability. Additionally, new EOR methods have been developed using nanoparticles, such as targeting thermal, chemical, and gas methods. Despite the promising results, there are still many challenges and opportunities for future research. This article was authored by Xiaofei Sun, Yinyu Zhang, Guangping Chen, and others.