To properly understand and interpret the metaphors of a poem is never easy since it is not a mere result of understanding the linguistic constituents or structures of the poem. To find the connotative meaning of the poem involves a complex process of figuring out what metaphors the poem uses, and identifying what cognitive strategies the poet uses to make that connotative meaning clear and understandable. This paper takes the fifth poem from the book Miscellaneous Poems of the Year Jihai as example to decipher the profound metaphoric meanings of the poem based on the framework of Mental Space Theory (Fauconnier 1994, 1997; Fauconnier and Turner 2002). In this paper, it has been suggested that the cognitive concepts such as event frames, image schemas, mental spaces, etc. all provide important clues for understanding the poem.