In the battle of Jingnan, Judy wanted to seize the throne of his nephew Zhu Yunwen for the following reasons:

First, Judy's rebellion was completely driven back. It is said that after Zhu Yunwen became emperor, he was too afraid of the influence of the captaincy and began to "cut the vassal". The starting point of "cutting vassals" was good, but Zhu Yunwen was young after all, and he was so worried that many vassal kings were beheaded or committed suicide in the process of "cutting vassals". In this case, Judy had to consider for her own life and finally embarked on the road of rebellion.

The second reason is Zhu Yuanzhang's eccentricity. Judy was not liked by Zhu Yuanzhang since she was a child. Although Judy fought against Zhu Yuanzhang all the year round and made great achievements, he never got Zhu Yuanzhang's attention. Although Judy hates Zhu Yuanzhang very much, he never shows it. Zhu Biao, the eldest son of Zhu Yuanzhang, won the trust of Zhu Yuanzhang. Originally, Zhu Yuanzhang wanted Zhu Biao to succeed him as emperor, but Zhu Biao died young in. After Zhu Biao died, Judy thought he could become a prince and an emperor. To his surprise, Zhu Yuanzhang set Zhu Yunwen as the Crown Prince despite the opposition of ministers. In fact, Zhu Yunwen was made a prince, and not only Judy was unconvinced, but even all the princes were unconvinced.

The third is because of Yan Tao's persuasion. Dao Yan's original name was Yao. Although he is a monk, he is very proficient in yin and yang. After following Judy, Dao Yan often advised him to rebel, but Judy always took it lightly. Yan Tao is a very persistent person. Although Judy didn't have the idea of rebellion at first, after a long time, the word rebellion was gradually engraved in Judy's heart. Every time I see Taoist Yan, he always thinks of the word "rebellion". Later, when Zhu Yunwen sent someone to arrest Judy, Judy thought it was not obedience or escape, but rebellion. It can be seen that Dao Yan's persuasion also played a great role.

It is for these reasons that Judy won the throne of his nephew Zhu Yunwen in the battle of Jingnan.