The particle UP is most frequently employed in English phrasal verbs,and its sense is traditionally considered unanalyzeable as prepositions and adverbs in English idioms.However,its sense can actually be analyzed according to the image schema in the Figure and Ground Theory,and its basic sense refers to the movement of something from a lower to a higher level or place.It features in phrasal verbs with thirteen main meanings including its conceptual metaphorical extensions and they have positive influence on the sense of phrasal verbs.