核心功能wp_insert_post() 可以添加（&E）创建帖子（每种帖子类型）。

插件

/*
Plugin Name: Add default blog pages
Plugin URl: http://goo.gl/5e1DC
Author: Kaiser
Author URI: http://unserkaiser.com 
 */
/**
 * Default Blog pages - used to define all default pages.
 * Adjust this to your needs:
 * For a full example of what you can define for every page, take a look at
 * @link http://codex.wordpress.org/Function_Reference/wp_insert_post
 * @return array
 */
function wpse50318_default_blog_pages()
{
    return array( 
        array(
            \'post_title\' => \'About\'
        ),
        array(
            \'post_title\' => \'Contact\'
        )
    );
}
/**
 * Adds Default Blog pages
 * @return void
 */
function wpse50318_add_default_pages_to_blog()
{

    foreach ( get_pages() as $page )
        $existing_pages[] = $page->post_title;

    // Get only non existing pages:
    $new_pages = array_diff( $GLOBALS[\'$wpse50318_default_blog_pages\'], $existing_pages);

    // Loop over the non existing & add them
    foreach( $new_pages as $page )
    {
        // Create post object
        $page[\'post_status\']  = \'publish\';
        $page[\'post_type\']    = \'page\';

        // Insert the post into the database
        wp_insert_post( $page );
    }
}
add_action( \'activate_blog\', \'wpse50318_add_default_pages_to_blog\' );