<?php if (is_page('pagename')) { query_posts('cat=yx') } ?>

<!--or use query_posts like this:(full loop)-->

<?php
    $displayposts = new WP_Query();
    $displayposts->query('cat=5');
    while ($displayposts->have_posts()) : $displayposts->the_post(); 
?>
  <?php the_content('read more...'); ?>
  <?php edit_post_link('edit', '', ''); ?>


<?php endwhile; ?>

<?php if (is_page('pagename')) { query_posts('cat=yx') } ?>

//or use query_posts like this:(full loop)

<?php
    $displayposts = new WP_Query();
    $displayposts->query('cat=5');
    while ($displayposts->have_posts()) : $displayposts->the_post(); 
?>
  <?php the_content('read more...'); ?>
  <?php edit_post_link('edit', '', ''); ?>


<?php endwhile; ?>

<?php if (is_page('xy')) { query_posts('cat=yx') } ?>

Wordpress display content of a category on a page

wordpress, category, theme

PHP