Civ VI: 6 players on a duel map | 文明VI: 6人玩决斗地图

First you need to find "Sid Meier's Civilization VI" in your Steam Library, right click on it and select Manage-browse local files and a folder will pop up.
在Steam库里找到文明6，右键选择管理-浏览本地文件，会弹出一个窗口。

If you are using a Windows system, go to /Base/Assets
Windows系统找到/Base/Assets

If you are using MacOS, you need to right click on the "Civilization VI" application then select "Show package contents", then go to /Contents/Assets/Base/Assets, situations may vary.
MacOS系统右键点击文明6应用然后选择显示内容，然后找到/Contents/Assets/Base/Assets 实际情况可能略微不同。

Go to Assets/Configuration/Data/ then you will find "MapSizes.xml", this is for ordinary maps such as "Continents", "Highlands" and "Inland Sea".
找到Assets/Configuration/Data/ 下的"MapSizes.xml"，这个文件控制常规地图如“大陆”、“高地”和“内海”。

DUPLICATE IT FIRST then open the file with Notepad/TextEdit, use Ctrl/Cmd+f to find a line with:
先备份文件然后用记事本/文字编辑打开，搜索：

MapSizeType="MAPSIZE_DUEL"

You may have your own ideas and below is my settings with maximum 6 players, default 6 players and 4 city states.
各人有不同偏好，我的设置是最多6个文明，默认6个文明4个城邦。

<Row MapSizeType="MAPSIZE_DUEL" Name="LOC_MAPSIZE_DUEL_NAME" Description="LOC_MAPSIZE_DUEL_DESCRIPTION" MinPlayers="2" MaxPlayers="6" DefaultPlayers="6" MinCityStates="0" MaxCityStates="6" DefaultCityStates="4" SortIndex="10" />

You may also wish to try it on other map sizes.
也可以顺便修改其他尺寸的地图。

Still in this folder, there are two more: BalanceMaps.xml for "4-Leaf Clover", "6-Armed Snowflake" and "Mirror" (changing the max number of players on a balance map may cause error); EarthMaps.xml for those real maps such as "Mediterranean Large", "Earth Huge" and "True Start Location Europe".
还是在这个文件夹内，还有另外两个文件：BalanceMaps.xml控制平衡地图，如“四叶草”、“六瓣雪花”和“镜像”（修改平衡地图的玩家数可能会报错）；EarthMaps.xml控制一些真实地图如“地中海（大型）”、“地球（极大）”和“欧洲（真实开局位置）”。

Of course you can do this easily with a mod, for instance "ARS - More Players" by Arstahd.
当然也可以用mod快速解决，比如Arstahd的"ARS - More Players" 。

https://steamcommunity.com/sharedfiles/filedetails/?id=2118297372&searchtext=more+players

Go to Assets/Gameplay/Data/ then you will find "Maps.xml", DUPLICATE IT FIRST then open the file with Notepad/TextEdit, use Ctrl/Cmd+f to find a line with:
找到Assets/Gameplay/Data/ 下的“Maps.xml”，先备份文件然后用记事本/文字编辑打开，搜索：

MapSizeType="MAPSIZE_DUEL"

You may have your own ideas and below is my settings with 4 natural wonders and 3 great prophets.
各人有不同偏好，我的设置是4个自然奇观3个大预言家。

<Row MapSizeType="MAPSIZE_DUEL" Name="LOC_MAPSIZE_DUEL_NAME" Description="LOC_MAPSIZE_DUEL_DESCRIPTION" DefaultPlayers="6" GridWidth="44" GridHeight="26" NumNaturalWonders="4" PlateValue="3" Continents="1"/>

<Row MapSizeType="MAPSIZE_DUEL" GreatPersonClassType="GREAT_PERSON_CLASS_PROPHET" MaxWorldInstances="3"/>

You may also wish to try it on other map sizes.
也可以顺便修改其他尺寸的地图。

I usually only play "duel" or "tiny" maps with no more than 6 Civs, but if you wish to have more than 12 players you may need to find Assets/UI/FrontEnd/Multiplayer/StagingRoom.lua, see this guide below by Kaito-san, or you can subscribe Arstahd's "ARS - More Players" mod mentioned above.
我通常只玩决斗和极小图，不超过6个文明，但是如果需要超过12名玩家你需要找到Assets/UI/FrontEnd/Multiplayer/ 下的 “StagingRoom.lua”，详见下面的Kaito-san的指南，或订阅上文提到的mod "ARS - More Players"。

https://steamcommunity.com/sharedfiles/filedetails/?id=1567304725