In spite of their great differentiation, they’re motivated by the similar force-barrier image schema, which is the basis for the metaphorical projection that explicate the construal of epistemic and extension of deontic.

The metaphorical projection was discussed about words meaning from the cognitive perspective.

This paper analyzes the cognitive construction process of prepositional usages by using metaphorical projection principles and decoding process of them by using mental space.

Researches in the regard of metaphor at home focus more on its positive functions,while few researchers pay attention to the potential negative influences of metaphorical mappings.

Sweetser(1990) discusses modality within polysemy,and she claims that polysemy is often motivated by a metaphorical mapping from the concrete,external world of socio-physical experience to the abstract,internal world of reasoning and of mental process in general.

This paper makes an attempt to account for the dynamic processes of the relationship between cognitive development, metaphorical mapping and the expansion of lexico-semantic categories in Chinese, the ultimate purpose of which is to reveal the internal mechanism of the formation of Modern Chinese lexical system.

The metaphorical mapping in construction of transferred meanings of BACK is divided into five categories.

Prepositions develop their polysemy on the basis of their spatial concepts by metaphorical mapping, which produces abundant colorful metaphorical meanings of the prepositions.

Viewed from cognitive semantics,we can know that the preposition on develops abundant meanings on the basis of the spatial concept by metaphorical mapping.