正如我在评论中所说的，

您需要使用get_option( \'posts_per_page\' ) 和get_query_var( \'paged\' ) 计算您的帖子编号

您可以执行以下操作：（我对代码进行了注释，使其易于理解。这将进入函数。php）

function get_post_number()
{
    global $wp_query;

    /*
     * Get current page number. Set page 1 to one as get_query_var( \'paged\' ) will be 0
     */
    $current_page_number   = get_query_var( \'paged\' ) ? get_query_var( \'paged\' ) : 1;
    /* 
     * Get the posts_per_page option that is set under "Reading"
     */
    $posts_per_page        = get_option( \'posts_per_page\' );
    /*
     * Get the current post position in the loop, add 1 because the counter starts at 0
     */
    $current_post_position = $wp_query->current_post + 1;

    /*
     * If this is page one, return the post position as is
     */
    if ( $current_page_number == 1 )
        return $current_post_position;

    /*
     * Calculate the post number on paged pages
     */
    return ( $posts_per_page * ( $current_page_number - 1 ) ) + $current_post_position;
}

echo get_post_number();