The product is a complete semiotic system for transmitting the message and expressing the meaning of the object.Hermeneutics is the subject to analyze the understanding and language communication.The aim of this subject is to make the communication and understanding between different people become more comfortable.This paper discusses the product semantics by the theory of understanding and message expression.The idea of designer and the context of use are combined to develop the hermeneutic situation,by understanding the physiological status,psychology and behavior,from the aspect of language situation in hermeneutics.Therefore,the philosophy is applied in the product design.