Abstract: Metaphor, as a design method, is widely used in the design of interaction interface of products.The reason for the existence of metaphor in interaction interface is similarity and mapping.There aremainly three types of metaphor:interface structural metaphor, interface functional metaphor and interface symbol.The general cognitive model of product interaction metaphor is the constraints and unification of five elements including cognitive subject, form vehicle, content vehicle, similarity and mapping, and cognitive context.