The modification methods of polyamide (PA) and the development direction in the future are introduced. The filling modification of PA plays an important role in polyamide modification and is used more and more widely. A variety of products with excellent properties can be prepared by using polyamide resin as base material and adding fiber, natural or synthetic filler; various brands of products can be made by adding fiber, red phosphorus and other fillers to PA66 and PA6 and are widely used in automotive, electronic and electrical, consumer goods and industrial fields. Filling modification and blending modification are the main methods of PA modification, filling modification is an important method of PA modification, and other methods, such as blending, strengthening PA and new functionalization of PA, will also be the main research and development direction of PA in the future.