Mandate of Heaven

Celestial Empire (Page 1)
The minimum autonomy of Celestial empire is now set to 15%, but this super-advanced government type now has 5 passive modifiers which weaken the empire even more than the minimum autonomy does in the vanilla game. These modifiers are Gentry's Landholding, Artisan's Regulation, Wei-Suo System, Trade Limitation and Foreign Ignorance. Accepting Institutions will NOT remove these modifiers, thus Ming's priority can now be elsewhere. So how to remove these modifiers? There are 3 ways, one temperately by issuing reforms (check the decision penal for details), one permanantly by the combination of idea groups, and one by using the 'No More Celestial Empire' decision which is highly costy.

Government reform (Page 2)
Celestial empire government can now be reformed into a more advanced type through the 'Reform the Government' decision. Although still having the five modifiers, reformed Celestial Empire can issue temperate reforms much more easily, and this government type can be further reformed to Absolute Monarchy when you reach adm tech 18.

Tributary system (Page 3)
There is also a tributary system for the celestial empire, mostly for fun. Other countries can send tribute to the empire and expect good rewards. Chinese emperors are always generous, so you will be welcomed - even with empty hands.