The demise of the Northern Song Dynasty was mainly due to the combined effect of multiple factors such as internal political corruption, external aggression, economic difficulties, and military defeat. Specifically, there was a serious problem of political corruption within the regime of the Northern Song Dynasty, the Jin Dynasty was the main external threat of the Northern Song Dynasty, and the Northern Song Dynasty's excessive investment in military and cultural construction led to an increase in financial pressure, and at the same time, due to political corruption and political corruption, the discipline and combat effectiveness of the army declined.
Introduction
The Northern Song Dynasty, a dynasty that had flourished in Chinese history, eventually fell in 1127 AD. In the process of its rise and fall, we can see that the prosperity and decline of a country are closely related to its internal political, economic, military and other factors. The economic and cultural prosperity of the Northern Song Dynasty laid a hidden danger for its demise.
The reason for the demise of the Northern Song Dynasty
Internal causes. The problem of political corruption in the Northern Song Dynasty was serious, which led to an empty treasury and financial difficulties. At the same time, due to political corruption and political corruption, the discipline and combat effectiveness of the army have greatly declined, and it is unable to effectively resist the aggression of foreign enemies.
External causes. The Jin Dynasty was the main external threat of the Northern Song Dynasty. The rise of the Jin Dynasty created an aggressive desire for the rich Northern Song Dynasty, which eventually led to the demise of the Northern Song Dynasty.
The process of the fall of the Northern Song Dynasty
In the autumn of 1125 AD, the Jin state tore up the peace agreement with the Northern Song Dynasty and launched a full-scale war against the Northern Song Dynasty instead. The army of the Jin Kingdom swept in like a storm, and the troops were divided into two routes, one was led by the brave and warlike Wanyan Zonghan, and the goal was directly aimed at Taiyuan; The other route was led by Yan Zongwang, and their target was Yanjing. The Northern Song Dynasty army was powerless under this sudden attack, and soon collapsed in the war, and Taiyuan, Yanjing and other places fell one after another. By 1126 AD, the Jin army was approaching Bianjing, the capital of the Northern Song Dynasty. This news was like a thunderbolt from the sky, which made Song Qinzong Zhao Huan panic. In order to calm down the turmoil as soon as possible, he dismissed Li Gang, the minister of the main war faction who resolutely advocated resistance to Jin, and chose to sue for peace with Jin. However, this provided an opportunity for the Jin army to attack, and they took the opportunity to launch a fierce attack and surround Bianjing. In 1127 AD, the Jin army broke through the city defense of Bianjing, and the once prosperous capital fell into a sea of fire. The capture of Emperor Huizong of Song, Emperor Qinzong of Song, and members of the royal family in this catastrophe marked the official end of the Northern Song Dynasty. Subsequently, the Jin State established a puppet Chu regime in the Central Plains and brutally ruled the remnants of the Northern Song Dynasty. 
The process of the demise of the Northern Song Dynasty was a subversion from the inside out. From the outbreak of war, to the siege of the capital, to the capture of the emperor, this series of events happened like dominoes, and finally led to the fall of the Northern Song Dynasty. The Northern Song Dynasty's reform attempts and failures
When the Northern Song Dynasty was faced with a difficult situation, it tried to change the law, but due to various reasons, these changes ended in failure. Among them, the influence of party struggle cannot be ignored, it exacerbated the internal contradictions of the Northern Song Dynasty, and further accelerated the demise of the Northern Song Dynasty.
Conclusion
The demise of the Northern Song Dynasty has left us with a profound lesson. The rise and fall of a country is closely related to its internal political, economic, military and other factors. Only by facing up to these problems can we avoid the repetition of history and provide enlightenment for our modern society. We should learn from history, learn from history, cherish peace, and work hard to make the country strong.