1.The sphere of influence of other civilizations can be extended by the construction of specific buildings,but the influence of the Chinese was always limited to a small area of the Imperial Academy,it becomes less and less useful later in the game.So, I suggest that all landmarks provide influence and collect taxes like the Imperial Academy.In order to balance, the amount of taxes produced can be reduced.The effect of the Imperial Academy can be changed to having a larger sphere of influence, increasing the limit of one imperial official, and obtaining one imperial official for free after construction.
2.From the characteristics of each dynasty in the game, we can see:The Tang Dynasty represents population growth,The Song Dynasty represented economic prosperity,The Yuan Dynasty represented raid and harassment,The Ming Dynasty represents the final battle.
The Song effect is the same as the French civilization characteristics, and in order to suit Tang characteristics, I think it can be changed this way:Village raise the cost, can produce villagers (reasonable！), but the production time is extremely long; Song effect changed to gain 10% more gold (including mining, taxes, trader).
Yuan acceleration effect is not new, many civilizations have similar effects, it is recommended that all units charge faster, and can trigger charge more frequently.This will also work well with the fire lancer and increases chances of being countered.
The Ming Dynasty is the biggest problem, the cost is too high, the benefit is too small, it is hard to see the Ming Dynasty in 1v1 play a role. In keeping with the Chinese theme of gunpowder, it is suggested that effect changed to all gunpowder units attack speed be increased.In addition, the second landmark of each dynasty must be reduced in price (20% / 35% / 50%).
3.Grenadier is a joke！Grenadiers may be good in numbers, but in general it is impossible to achieve, most of the time they are junk units.Proposed change: Drastically reduce attack speed, but all units hit by Grenadiers are marked within 5 seconds, and each time they take damage they take 2 extra damage.In this way, it can be used even in a small number. It also works well with Zhuge Nu and Nest of bees.
4.The Imperial Palace looks useful, but it is weak compared to other civilization landmarks. A new effect is proposed: After the death of the Palace Guards, the attack speed of other units is increased by 20% and they recover 2 health per second for 10 seconds (same effect as the Spirit Way).
Hopefully someone can add to that.