Hou Junji, although starting off with mediocre abilities, quickly improved his knowledge of military and literary arts through learning and the assistance of highly skilled individuals after following Li Shimin.

While serving under the command of Li Jing in the conquest of Tuguhun, he served as the general in charge of the marching army and achieved victory in pursuing the enemy. As the commander of the entire army, he led the troops to cover more than 7,000 miles and ultimately destroyed the Gaochang Kingdom. He also served as the Minister of Officials, where he excelled in hosting the selection and assessment of officials by formulating corresponding regulations and assessment topics, receiving widespread praise.

Hou Junji made numerous contributions to the Tang Dynasty, but his private moral character was questionable, described as "having a twisted mindset". Later, he was exposed for coveting war trophies, was impeached, and thrown into prison. Although he was quickly released by Li Shimin, his mindset became narrower and more paranoid. Feeling that he had made such significant contributions to the country but was punished for corruption, he felt that the emperor had treated him unfairly and doubted that he would be reused.

At this time, Crown Prince Li Chengqian was worried about being deposed and wanted to find help. He learned of Hou Junji's complaints and dissatisfaction and asked his son-in-law, Helan Chushi, to approach Hou Junji to discuss a plan. After discussion, they eventually formulated a rebellion plan to use force to make Li Chengqian ascend the throne early and make Li Shimin the supreme emperor.

However, the rebellion plan was quickly exposed, and the informant was actually Helan Chushi, Hou Junji's son-in-law. As a result, Crown Prince Li Chengqian was deposed, and Hou Junji was to be executed according to the law, with his entire family to be killed. However, Li Shimin believed that Hou Junji had made great contributions to the country and did not want to execute him. Nevertheless, the ministers advised in succession that Hou Junji's crimes were unforgivable. Ultimately, Li Shimin was forced to issue an edict to execute Hou Junji. Before the execution, Hou Junji requested that his wife and son be spared so they could mourn for him.

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