This paper attempts to analyze the ambiguity of poetry and understand the reasonable boundary of poetry theme by combining the Book of Songs Qin Jian and Li Shangyin's Untitled.

Li Shangyin's love poems inherited the tradition of Qin Feng's concurrent poems and Nan Zhou's Han Guang's singing, which sang the lost and sad love but could not meet each other, and directly expressed his unique love experience. The lyric images in his love poems can be basically divided into three categories: the first category is the love images in the poet's youth; The second category is the poet's wife Wang; The third category is the love object that can't be investigated. These poems

Thinking leads to mystery, attracts people to dreamland, and makes people appreciate a hazy beauty between solvable and unsolvable. Also let us see a sharp-minded, emotional, sentimental, want to spit back Li Shangyin. Li Shangyin's love poems are always unforgettable, and the pursuit of love is often hopeless and unstoppable. Even with a life-and-death attitude. Therefore, his love poems always show a sincere and deep lingering emotion. If there is no title:

It was a long time ago that I met her, but since we separated, the time has become longer, the east wind is blowing, and a hundred flowers are blooming.

Silkworms in spring will weave until they die, and candles will drain the wick every night.

In the morning, she saw her hair cloud changing in the mirror, but she bravely faced the cold of the moonlight with her evening song.

There are not many roads to Pengshan. Oh, Bluebird, listen! -Give me what she said! .