I have Gnome installed on my manjaro, but i want to swtich to deepin desktop envrinoment, and uninstall all gnome stuff, how can i do it ?
You shouldnt. Deepin is not supported until they fix themselves.
The bad news is if you really want deepin you'll have to find a new distro for now. The good news is you will have a very nice fresh new install to enjoy.
Download Deepin, wipe Manjaro and start fresh.
Please help us next time with a title that makes sense and describes you problem.
Deepin is indeed not supported, read the Arch Wiki how to install it. https://wiki.archlinux.org/index.php/Deepin_Desktop_Environment
If you have issues expect that you must fix them yourself.
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