QT is a common UI program development tool on Linux systems.
For debian on YY3568, there are two ways to develop QT programs. The first is the traditional cross-compilation approach, where QT Creator is run on the PC, and then the program is placed on the YY3568 after the cross-compilation is completed. The second way is to install QT Creator directly on the board. Since the debian on the board can be configured easily using apt, the second way is used
YY3568 already has a GUI environment on top of debian, and QT depends on it. So you don't need to do any special configuration, just execute the following command
apt-get install gcc g++
apt-get install build-essential
apt-get install qt5-default
apt-get install qtcreator
After installation, click Start - Programming - Qt Creator on the desktop of the board to open Qt Creator, the rest of the operation is the same as Qt Creator on the PC.