This entry gives brief introduction to installation of cursor themes in deepin.
After downloading and installing the deb file of the theme, you can open deepin control center -> Personalization -> Theme, and choose the installed theme.
Open file manager with root permission
sudo dde-file-manager /usr/share/icons
and copy all theme files here, according to the directory hierarchy of the original archive file.
Then go to /usr/share/icons/default/, open file "index.theme" (create one if it does not exists), delete all existing content and add a new line to it:
Inherits=XXX
where "XXX" is the directory name of the theme.
Now you can open deepin control center -> Personalization -> Theme, and choose the installed theme.
Open file manager with root permission
sudo dde-file-manager /usr/share/icons
and remove the files introduced by the theme during installation.