After Huang Taiji died, because he did not leave a will to specify who was the successor, so the emperor of the Qing Dynasty fell into a vacant position. So, Huang Taiji's son Haoge and his younger brother Dorgon Dorgon began to compete for the throne, but no one obeyed each other. In the end, both sides supported Huang Taiji's other son Fulin ascended the throne, which is the Emperor Shunzhi . Dorgon supported Fulin as the emperor. What was the reason for him to do this? Why didn't he become the emperor himself?
Why didn’t Dorgon become the emperor himself? 
Actually, this is easy to understand. He really wanted to be the emperor, otherwise he would not have fought for the throne after Huang Taiji's death. But he was not the successor, and Huang Taiji's eldest son Haoge was also very strong at that time. Huang Taiji did not leave a will, and the Qing Dynasty did not have the tradition of having to take over his son, so Dorgon could become the emperor. But Haoge is not weak, and due to the influence of Chineseization, it is natural that he takes over.
Both sides are not weak, and Haoge has received strong support from Zhenghuang Banner and Inlaid Yellow Banner , and the Zhenglan Banner, which Huang Taiji has been assigned to his command during his lifetime, was even commanded by Haoge himself. Behind Dorgon are the Zhengbai Banner and the Inlaid White Banner. His brothers, Ajige and Dodo, are also strong backings, and there are many supporters of Dorgon among the other banners. The two sides have been arguing and a war is about to break out. Therefore, for the two of them, no one can become emperors, they can only compromise with each other.
Dorgon supports Fulin as the emperor. What is the reason for him to do this?
First, choose Fulin to facilitate your regent
Since you can't be the emperor, you have to choose Huang Taiji's son, then of course you should choose a young person. In this way, Dorgon can serve as the regent minister and can completely control the power. For Dorgon, he is not an emperor, but better than an emperor. Therefore, Fulin is a good choice.
Third, Fulin's mother has a prominent position
Fulin is young, and Fulin's mother Zhuang Fei's family is a powerful and wealthy Korqin , so choosing Fulin also means gaining the support of the forces behind it.
