I'm a new guy in Linux development and I used to develop drivers and application in command line mode.
NowI'm very interested in developing programs in X window.So I want to know there are how many develop IDEs in X window and which is most popular.I want my application can be run in KDE and GNOME and easy to move to other X WINDOW. Now I know some c/c++ develop IDE such as Kdevelop and QT,jave develop IDE eclipse,and Tcl/TK. Can somebody explain these IDES clearly for me? I want to know which is the most powerful develop tools to develop X Window application. thanks for your help!

The thing is that you can write for pure X Window or use one of the libraries. The difference is that using pure X (Xlib) is very time-consuming. Libraries (like Qt or GTK, wxWidgets and so on) make it much easier. So you'd rather use one of the libraries. The question which one to choose is not an easy one - it's just a personal preference or just one of the libraries supports something your need better than the others.

Then, GUIs. For C/C++ check Anjuta and KDevelop. The difference between them is that Anjuta is more GTK/GNOME related, where KDevelop is more connected with Qt/KDE.
For Java you can use Eclipse (but KDevelop also supports it, if I remember correctly).
I'd not recommend you to use Tcl/TK.

To answer your question, I can't tell you which one is most powerful. I'm afraid you'll need to install and test them, to see which one fits your needs best.

If working without a IDE and programming your GUI directly, I'd re-
commend GTK, as it's really easy to code (and really free, different from
QT)

For a tutorial (GTK2), check http://www.gtk.org/tutorial/.

You may run such an application under Gnome as well as under KDE
(as long as the required libraries are installed).

thanks for your advice.I'll try and test them one by one.

if you decided to program without any other libraries than xlib, have a look at the Xlib Programming Manual (http://www.oreilly.com/catalog/v1/index.html), it helped me a lot.