There are basically two types: the first is a linear structure, and a polymer compound with this structure is called a linear polymer compound; the second is a body structure, and a polymer compound with this structure is called a body polymer compound. . Some macromolecules are branched, called branched macromolecules, which belong to the linear structure. Although some polymers have cross-links between molecules, they are less cross-linked, which is called a network structure and belongs to a body structure.

Two different structures show two opposite properties. Linear structure, can be melted by heating, with less hardness and brittleness. The body structure is harder and brittle. Plastics have two types of macromolecules. Those made of linear polymers are thermoplastics, and those made of body-shaped polymers are thermosetting plastics.