Joining the army is an old topic in Yuefu. These seven poems are not necessarily temporary works, but they are a complete frontier fortress suite. Selected Comments on Ten Thousand Sentences of Tang Poetry said: "All the works of Joining the Army were high-profile and hearty in the prosperous Tang Dynasty, and there were not many words." This group of poems not only wrote the heroic spirit of serving the country safely and courageously, but also expressed the homesickness and sadness that they could not get rid of. The thoughts and feelings expressed in the poems are diverse and rich, with both the heroic ambition to serve the country and the true humanity of people who are war-weary and homesick for peace. First, it is touching to express the homesickness of the border people with detailed descriptions; Fourth, write about soldiers' feelings of defending their country and their desire for victory under difficult circumstances; Fifth, write exciting victory scenes.
It is worth noting that this group of poems is not the poet's personal works, so many of them are fictional and indistinguishable. The reason for the investigation is that Yumenguan is in the northwest of Snow Mountain (Qilian Mountain), Qinghai Lake is in XueShan Zhinan, and Taohe River is in the southeast of Qinghai Lake, separated by thousands of miles. Human vision can't be balanced at all. But for people living in Chang 'an area, these place names are all the northwest frontier and can be summarized in poetry. Knowing this, people are in an "isolated city", looking at "Yumenguan" in the west, and the enemy is captured in "Taohe River North" in the southeast of Qinghai. It is not difficult to understand that the geographical span is large and unreasonable.