The latest PyQt4 installer includes QScintilla 2.8.1, which got support for input 
methods (see msg464). That's why it works for the latest PyQt4.

Issue closed because the reason is outside eric.

It's PyQt4 problem!!! When I update the newest version PyQt4-4.10.4-gpl-Py3.3-
Qt4.8.5-x64.exe! Eric5 editor work fine! Before that I use PyQt4-4.10.3-gpl-Py3.3-
Qt4.8.5-x64.exe will result can't input use chinese input software!!!

I updated to newest eric5-5.4.3 from eric5-5.3.1 today. Somehow chinese input 
software can't type any thing to the editor. Try to uninstall the newest to net 
older version, that's don't work again. For this reason I have to change to eric4 
in python 2.7.6 version  that's still working. so could help us solve this 
problem? thank u a lot.

Do other Qt applications (besides eric) have the same issue? You may try this 
with the example text editor of Qt/PyQt. It is possible, that your input method 
plug-in is not compatible with Qt. Another thing to note is, that QScintilla 
(the editor widget used by eric), just recently got support for input methods 
(as of 2.8.1 snapshots). Maybe it is a good idea, to ask for support in the eric 
and/or PyQt mailing lists.

Sorry for that.

It isn't too diffcult.We inupt Chinese characters by American keyboard.If 
convenient,you can download a Chinese input method from here:  
http://pinyin.sogou.com/softdown.php?v=6.8&type=c&ref=indexbanner

Unfortunately I am not in a position to find the cause for your observation 
because I don't have a Chinese keyboard or know how to input Chinese characters 
using a normal keyboard.

I found T can paste Chinese characters into Eric and they could be shown 
correctly.But I can't input them directly by typewriting.

How do other Qt/PyQt4 applications behave? If all inputs don't work I suspect 
something else is wrong.

I mean thr command line of 
Eric5,the"run window" ,the 
command line of my operating 
system can input Chinese.

If even the command line cannot accept Chinese characters, it is a configuration 
problem of your system and not an issue with eric. I'll close this issue. If you 
resolve your system configuration and everything else works fine and the issue is 
still present in eric, please reopen it.

I've tried all these you said,all of them--even the commandline can't input 
Chinese characters.

Did you configure the encodings correctly (Python config page)? Does this happen 
for all input controls or just the editor? If it is just for the editor, does the 
QScintilla demo application (simple editor) work?

Well,when I tried to input Chinese characters,there was nothing happen.....I 
pressed my 
keyboard,but there's no character do appear.When I try to input English 
letters,they 
will appear in Eric at once........Please ignore my terrible English ...

What happens when you try to input Chinese characters? Please be a bit more 
descriptive.

I think it worked in the past, when some Chinese guy used eric and contribute 
the Chinese translations. Further on, eric seems to be used much in China 
because China is at the top of the downloads.

I can input English in Eric5,but can't input Chinese