The first reason is political need, and it is also the main reason for establishing Yin Ren as the Crown Prince. When Emperor Kangxi was in power, there were internal troubles and foreign invasion: there were many governors in the imperial court, and Chu Jun's position affected many people's desires, so Emperor Kangxi was extremely uneasy. In order to avoid the expectations of his consorts, he chose Yin Geng as the prince.

The second reason is filial piety. Some people think that Kangxi was "obeying an imperial decree" before he decided to make Yin Ren the Crown Prince. If he doesn't set up a crown prince, it shows that he is unfilial to his ancestors. It is also unfilial not to eliminate the civil war and appease the people. As a result, three seemingly unrelated things, civil war, filial piety to the empress dowager and training the crown prince, were stirred up in the heart of Emperor Kangxi. At that time, although Kangxi had been concentrating on military affairs, he still took the time to personally study, ride and shoot the Pope Prince. At the same time, he ordered college students Brinton and Li Guangdi to be full-time teachers of the Prince, and ordered college students Xiong Cilv to teach all kinds of books to the Prince, attaching great importance to cultivating Yin Ren.

The third reason is emotional factors. Kangxi loved Yin Ren's biological mother, but died in childbirth. Therefore, some people think that Kangxi transferred his feelings for the queen to Yin Ren, loving me, loving my dog. Deciding to appoint Yin Ren as the Crown Prince, on the one hand, can cut off the idea of seeking a position in the Sixth Palace, on the other hand, it has placed Kangxi's inner desire.

And he was abolished several times because he was too disappointing and made many mistakes.