On the surface, this poem describes the feeling of historical changes, impermanence and unpredictable rise and fall. However, if we look at the situation of the separatist regime in the buffer region at that time and Liu Yuxi's mentality of paying attention to state affairs, we will know that the significance of nostalgia is actually hurting the present. Taking history as a mirror, the author warns today that the division of the Three Kingdoms and the Six Dynasties has become history, and the Tang Dynasty is still a unified country, but the buffer region has been supporting troops for many years. Under the peaceful scene of "being at home in the four seas", the poem "Poetry Zhai" says: "It's been too long, and the ambition of thinking has been exhausted. This shore is the victory of homesickness. " In the first sentence, "Since Wang Jun came down from Yizhou with a towering ship, the imperial ghost has languished in Nanjing", the poet did not write from the specific scenery in front of him, but described the thrilling battle in the area of Mount Cisai with concise pen and ink, showing a magnificent historical picture. In 280 AD, Sima Yan, Emperor Wu of the Jin Dynasty, ordered Wang Jun, the secretariat of Yizhou, to lead the elite water army down the Yangtze River and take Jinling (the capital of Wu State) to complete the great cause of reunification. "Xiayizhou" refers to putting the word "Xiayi" before "Yizhou" from Yizhou down, rendering a majestic and condescending marching momentum, and also laying the groundwork for Wu's downfall. The word "terrible" not only shows the fear of Wu Jun, but also indicates the inevitable fate of Wu's failure.

Zhuan Xu wrote about the futility of Wu's dying struggle and the ugliness of being forced to surrender. "Chihiro Iron Lock" describes Wu Jun's fortifications as very strong, which almost blocked the whole river. But because of Wang Jun's resourcefulness, he quickly broke Wu Jun's defense. The word "Shen" seems ordinary, but in fact it is extremely amazing. Its image shows that with the sinking of the chain, the Wu regime disappeared forever in the long river of history. A falling rock describes the ugly behavior of the monarch of Wu when he surrendered. One Piece is very small, and Surrender contains satire and ridicule. In a word, the first four sentences of the poem explain the commander of the war, the route of marching, the way of fighting, the process of breaking through the Yangtze River defense line and Wu's surrender, which has profound meaning in the content of nostalgia: the consolidation of a political power depends not on the danger of the terrain, but on the people's hearts; Without people's hearts, any other fortifications are useless.

The sentence of "the cycle of change has moved to the past" in the necklace is a link between the preceding and the following, which struggles readers' thoughts out of historical sorrow and returns to reality, summarizes the history of frequent regime changes in the Southern Dynasties for more than 300 years, and specifically illustrates the inevitable consequences of losing people's hearts and not being kind to the people. The poet personifies the transcendental spirit of Mount Cisse. "Still" means that it was like this 300 years ago and it is still like this 300 years later. However, all the heroes in the world are not smart enough. They insist on relying on steep mountains and rivers to dominate the country, and it is inevitable that they will be ridiculed by Mount Cisse one by one. "Yamagata remains the same" is in sharp contrast with the hegemony of heroes, highlighting their sadness.

Tail couplet is the poet's emotional and gentle advice to the rulers of the Tang Dynasty. The phrase "every sea is today's home" is a passing phrase, praising the contemporary world in a praising tone. Through the comparison between ancient and modern times, the poet deeply felt that the unified inheritance of Datang for more than 200 years was precious. In addition, the poet praised "being at home in the four seas", which showed his firm position of safeguarding national unity. The sentence "The old fortress is full of ruins and autumn reeds" means that the former military fortress is now abandoned in the autumn wind. This ruined and desolate relic is a witness to the decline of the Six Dynasties and a symbol of the failure of division.

In short, in this poem, the poet pointed the edge of ridicule at the rulers who once occupied one side in history but eventually fell. The poet seems to be objectively describing the past and depicting historical sites, but it is actually a head-on blow to the separatist forces that re-emerged at that time. This lesson has also become a good mirror for the king.