what is the different between KDK and Gnome envirnment?
is the different is kernal?

Do you mean KDE and GNOME?
These are two different projects, even written in different languages and based on two different toolkits (that use different licenses). But neither of them have anything to do with the Linux kernel, they are just userland programs.

different licences mean?ithiought both using GPL licence?

No, the situation here is more complicated.
Different releases of Qt has had different licenses, although Gtk+ are invariably LGPL.
GNOME is GPL, but KDE had to follow a complicated path...

The most significant difference to most end users is that they like one more than the other. Which do you like better?

QT is currently offered under many licenses. And GPL is one of them if that's what suits you.

Different kde parts are licensed under many different open source licenses.

http://techbase.kde.org/Policies/Licensing_Policy

asliyanage, the kernel has nothing to do with this. No matter what desktop you use, you will always be running the same kernel and the same X server. The desktop is just a set of programs that runs in more or less integrated fashion inside X.

Just google a bit and try them on a livecd if you want. It's not difficult to find info on the matter. For each user the view is broadly different. A thing that you will inmediatly notice is that kde is very configurable, and I am not talking about the look (only). Gnome is not configurable at all. Their premise is that options are a bad thing. Whether that's a good thing or a bad one depends on your view, that's open for debate.

From a developer standpoint, I personally like c++/qt better than C for a graphical interface. A thing I like about kde is how modular is in which regards the technologies used inside of it. KDE reuses code and components in a very elegant and effective way. The source code for the KDE applications is usually much smaller than the gnome counterparts because of that. Most of the functionality is in kdelibs.