Nylon 66(PA66),as an important engineering plastic,features excellent mechanical properties,wear resistance and heat resistance,and is widely used in the automotive,electronic,mechanical and aerospace fields.However,its inherent high hygroscopicity,poor low-temperature toughness,insufficient processing fluidity and inadequate flame retardancy limit its application in some high-performance scenarios.In recent years,significant progress has been made in the modification research of PA66.Mainly through various means such as physical blending,chemical grafting, and copolymerization modification,its microstructure and macroscopic properties are regulated,thereby preparing composite materials with high strength,high toughness, low water absorption rate,excellent flame retardancy or thermal conductivity.This article introduces the research progress of various high-performance PA66 composites in recent years,analyzes the influence of various modification strategies on the structure and performance of the materials,and the preparation of various high-performance PA66 composites has expanded the application scope of PA66,which is more conducive to its development in high-performance and functional industries such as new energy and automobiles.