sudo pacman-mirrors -i -c China -m rank

sudo vim /etc/pacman.conf

[archlinuxcn]
SigLevel = Optional TrustedOnly
#阿里巴巴开源镜像站
Server = https://mirrors.tuna.tsinghua.edu.cn/archlinuxcn/$arch
#清华大学信息化技术中心
Server = https://mirrors.tuna.tsinghua.edu.cn/archlinuxcn/$arch

[arch4edu]
SigLevel = TrustAll
Server = https://mirrors.aliyun.com/arch4edu/$arch
Server = http://mirrors.tuna.tsinghua.edu.cn/arch4edu/$arch

sudo pacman -Syy

sudo pacman -S archlinuxcn-keyring

https://archlinux.org/packages/

AURURL="https://aur.tuna.tsinghua.edu.cn"