How to display post in only one category?

I use

<?php query_posts('cat=3');?>
<?php wp_reset_query();?>

It looks all right, but page navigation stuck,Just can display first page.

I found these code but also doesn’t work.can’t display any post.

<?php
$limit = get_option('posts_per_page');
$paged = (get_query_var('paged')) ? get_query_var('paged') : 3;
query_posts('cat=1&showposts=' . $limit=15 . '&paged=' . $paged);
$wp_query->is_archive = true; $wp_query->is_home = false;
?>