我想你在找add_meta_box

http://codex.wordpress.org/Function_Reference/add_meta_box

// Metabox actions
add_action( \'add_meta_boxes\', \'metabox_create\' ); // create
add_action( \'save_post\', \'metabox_save\' ); // save

// Create metabox
function metabox_create() {
  add_meta_box( \'metabox_name\', \'Metabox Title\', \'metabox_content\', \'my_custom_post_type\', \'normal\', \'high\' );
}

// metabox content
function metabox_content() {
  global $post;

  // custom field data
  $custom = get_post_custom( $post->ID );
  $field_name = $custom[\'field_name\'][0];

  // contents
  ?>
  <label for="field_name">Field name</label>
  <input name="field_name" id="field_name" value="<?php echo esc_attr( $field_name ); ?>" />
  <?php
}

// save metabox fields
function metabox_save() {
  global $post;

  // Ignore autosave
  if ( defined( \'DOING_AUTOSAVE\' ) && true === DOING_AUTOSAVE ) { return; }

  // Save post meta.
  update_post_meta( $post->ID, \'field_name\', $_POST[\'field_name\'] );
}