Without a link to your blog it's impossible to provide an absolute answer since we don't know your version or skin, so I'll go with what your version and skin might be. Open skins/your_skin/_main.php and find something that looks like this:

		<div class="bText">
			<?php $Item->content(); ?>
			<?php link_pages() ?>
		</div>

Now make it be like this:

		<div class="bText">
			<?php if( $disp != 'single' ) {
				$Item->content( '#', '#', '#', '#', '#', '#', 'xml', 200);
				} else {
				$Item->content();
				} ?>
			<?php link_pages() ?>
		</div>

If I was a gambling man I'd bet your last dollar on that doing what you want.

Thanks.
It works. Sorry, i forgot to say. my site is webmaster-internet.com. I use last version to b2.

btw, how about the answer of my question here: http://forums.b2evolution.net/viewtopic.php?t=9966

Thanks