Method 1: Switch by menu under the XWindows interface, find the desired menu, select the desired desktop, restart XWindows.
Method 2: At the command prompt
1. Switch to KDE If it is Justang Gnome, want to switch to KDE
1) Exit X-Win first
2) Implement SwitchDesk KDE first
3) The desktop is KDE when the startX runs X-WIN.
2. Switching into gnome if it is Just KDE, want to switch to become GNOME
1) Exit X-Win first
2) First execute SwitchDesk Gnome
3) The desktop is GNOME when the startX is running X-WIN.