yes, images are editable. we can use photoshop.
pdf is also editable, we can use acrobat professional
or other pdf editor. and pdf can be changed  more difficult
than doc or image. Of course, client can use camera to
get the computer screen.

I just have one object:
1. I can change origin file(e.g. word file) easily.
2. client can view and print my file, but can't
change my file easily.

Does any blue print can do this?

...

..

Good point.  But..

tamsun, *why* do you want the user to *not* be able
to edit these documents?

The answer might be..
a)  To protect the end-user from having inaccurate
 information after the 'instructions file' has accidentally
 been edited by a co-worker.
b)  To protect the document issuer from having *deliberately*
 edited (and false) documents in circulation.

Juc's suggestion of PDF is good* if the answer is 'a',
but even 'uneditable' PDF's can be copied directly out
of Acrobat viewer onto the clipboard, so it will not
be suited to the second part - 'b'.

Of course, there is *nothing* that provides complete
protection for the document issuer.  Once the information
has left your immediate control, once that information
is on the user's screen - they are technically able to do
whatever they want with it.

* As an aside - I hate PDF's, but at least they provide
a more useable form of information than images.

Andrew T.