The Wei Chi Nan Pei times consists of what we call "the former three states" and "the latter states." Generally speaking, "the former three states" indicates the situation dominated by three conflicting powers—Wei, Wu and Shuu—in balance in the early 3rd century. While "the latter three states" indicates the triangular balance of power among Dong-wei, Shi-wei and Liang in the middle 6th century, transformed into a state of opposition among three conflicting powers, Pei-chi, Pei-chou and Chen. Chyh Bih battle, a decisive battle, happening in 208 A.D., resulted in the triangular balance of power among "the former three states." While Sha Yuann battle resulted in the triangular balance of power among "the latter three states," while Sha Yuann battle resulted in the triangular balance of power among "the latter three states." Even if there states," while Sha Yuann battle resulted in the triangular balance of power among "the latter three states." Even if there have already been a flood of researches done into Chyh Bih battle in the history field. However, it is quite a pity that seldom can we get enough written documents about Sha Yuann battle between Dong-wei and Shi-wei. To make up for the insufficient researches for getting better understanding about Sha Yuann battle. In other words, it is to give much more background on the battle as well as does more researches into the process and causes for the final outcome; that is, why Shi-wei defeated Dong-wei. Furthermore, it will probe about what influence the battle has on the later history development as well. After Liow Jenn riot in the late Pei-wei in many aspects, eager and set to annex and exterminate Shi-wei at any time, whereas Shi-wei, though in great danger, to protect its only territory "Kuan Lung", had no option but to put lots of efforts to defend itself against Dong-wei. In September 537A.D., Gau Huan, the premier of Dong-wei, invaded in a westerly direction with a large army of about two hundred thousand soldiers, warring fiercely and violently with the defendant army of Shi-wei, less than ten thousand, leaded by Yu Wen Tai, the premier of Shi-wei, in Sha Yuann. On the one hand, Gau Huan took great pride in the huge armed forces; and even worse, some rival factions like Han people and Hwu people within the state were at odds with each other then. On the other hand, by taking good advantage of geography to shelter from the enemy fire and uniting the domestic competing factions into a cohesive whole to fight against Dong-wei together In the very long run, Shi-wei fought against heavy odds, defeating Dong-wei with much less army. Dong-wei lost eighty thousand well-trained soldiers and its premier Gau Huan fled in a rush. Then Yu Wen Tai took the opportunity to chase after the Dong-wei army, securing lots of territory, inclusive of the south and the east of the Yellow River, and also expanding the front line beyond Kuan Jong. Afterwards, even though there were a couple of large-scale battles between Dong-wei and Shi-wei, happening outside of Kuan Jong basically. Those battles were at most border incidents of fortress warfares and wouldn't threaten to ruin Shi-wei in the least. For one thing, Sha Yuann battle, a significant battle, really concerned whether Shi-wei could continue to exist or not. For another, the battling outcome not only resulted in the irreconcilable situation marked by open opposition between Dong-wei and Shi-wei, but in the meantime accelerated the state of the latter three conflicting powers standing opposite to one another in balance later on.