Emperor Xiaomin took the throne, but did not use the title "emperor" (皇帝, huáng dì), but used the
Zhou dynasty-style title "Heavenly Prince" (
Tian Wang). He posthumously honored Yuwen Tai as Prince Wen and the Princess Pingyi as Princess Wen. He created the former Emperor Gong the Duke of Song, but soon thereafter, the duke was executed. The governmental structure and ceremonies were largely imitative of Zhou dynasty, but also incorporated many
Xianbei elements, largely abandoning
Han customs originated in the post-Zhou centuries. He created his wife, Duchess Yuan, princess. With Yuwen Hu as regent, The political situation was unstable. About a month after Emperor Xiaomin took the throne, two of the most senior officials,
Zhao Gui the Duke of Chu and Dugu Xin the Duke of Wei, showed displeasure about Yuwen Hu's hold on power. Zhao wanted to kill Yuwen Hu, an action that Dugu tried to persuade him against. Soon thereafter, however, Zhao's plans were revealed by another official, Yuwen Sheng (), and Yuwen Hu had Zhao executed and removed Dugu from his office. Soon, he also forced Dugu to commit suicide. When another official, Qi Gui (), criticized Yuwen Hu's regency, he was also executed. Meanwhile, Emperor Xiaomin himself, wanting to take power, was engaging in a plot to kill Yuwen Hu. His plot included two of Yuwen Tai's key associates, Li Zhi () and Sun Heng (), as well as the other officials Yifu Feng () and Heba Ti (), each of whom was ambitious and therefore further tried to fan Emperor Xiaomin's suspicions against Yuwen Hu. After Li tried to engage another official, Zhang Guangluo () in the plot, however, Zhang revealed the plot to Yuwen Hu. Yuwen Hu, not wanting to take drastic actions at first, sent Li and Sun away to be provincial governors. When Emperor Xiaomin wanted to summon Li and Sun back to the capital
Chang'an, Yuwen Hu urged against it, pledging his loyalty. However, Yifu and Heba became fearful and plotted to carry out the plot anyway. Zhang again informed Yuwen Hu, who discussed the matter with the generals Helan Xiang () and Yuchi Gang (). Helan suggested to him to depose Emperor Xiaomin, and Yuwen Hu had Yuchi arrest Yifu and Heba and disband the imperial guards. Emperor Xiaomin, surprised by the move, barricaded himself in the palace and armed his
ladies in waiting and
eunuchs. Yuwen Hu sent Helan into the palace to force Emperor Xiaomin to leave the palace and put him under house arrest at his old residence as the Duke of Lüeyang. Yuwen Hu summoned the high-level officials and informed them the situation, proposing to depose Emperor Xiaomin and replace him with Yuwen Yu. The high-level officials, not daring to oppose Yuwen Hu, agreed. Emperor Xiaomin's coconspirators were executed, while he himself was demoted to the rank of Duke of Lüeyang. A month later, Yuwen Hu executed him and forced his wife, Princess Yuan, to become a
Buddhist nun. After another brother of Emperor Xiaomin,
Emperor Wu killed Yuwen Hu in 572, he posthumously honored Emperor Xiaomin as emperor and reburied him with honors due one. ==Family==