Imagery is an important concept of Chinese poetics, and it is also an important aesthetic principle in poetry creation. It is also the inspiration of the poet, the realization of life and the cohesion of life experience. In the Tang poems there is a large number of "sea" image depiction, the Tang Dynasty ear to enjoy the famous poet almost all have a good description of the works of marine imagery, the marine image of one of the characteristics of Tang poetry. This paper uses the electronic tool book system to search the poems of the ocean in the "Tang Poems", and analyzes and summarizes the significance and value of the ocean literature in the field of classical poetry.