I install gnome software centre by :  sudo yum install gnome-softwarebut when i open software centre it shows nothing NOTE : I am Using Fedora 20 Cinnamon DE
software center in fedora 20 not working?
fedora;software installation;cinnamon
I'm running F20 as well and your version looks a bit different than mine.    I would suggest un-installing it and trying to re-install. If that doesn't work then it's likely that the application maintains configuration info, perhaps in the $HOME/.config directory. I'd attempt to remove any files/directories related to this app and try running it with a clean slate.Tracking down apps cachesYou can use this trick to find out what directories gnome-software is accessing using strace.$ strace -s 2000 -o gnome-software.log gnome-software You can then grep through the resulting log file, gnome-software.log to see what locations the app's accessing. Typically with GNOME apps, there are config files under $HOME/.config.