emacs elpa
https://elpa.emacs-china.org/index-en.html
emacs ~/.emacs
(setq package-archives '(("gnu" . "http://elpa.emacs-china.org/gnu/")
("melpa" . "http://elpa.emacs-china.org/melpa/")))
M-x list-packages
Type M-x list-packages to open the package list. Press ‘i’ to mark for installation, ‘u’ to unmark, and ‘x’ to perform the installation. Press ‘RET’ to read more about installing and using each package.