看看WP_Query codex，它们有一系列可以使用的参数和示例函数。

首先设置您的参数，我包括了两种方法，第一种是使用内置category 参数。

$args = array(
    \'post_type\'      => \'post\',
    \'post_status\'    => \'publish\',
    \'posts_per_page\' => 12,
    \'category_name\'  => \'x\', // Use the category slug.
);

//Setup your arguments
$args = array(
    \'post_type\'      => \'post\',
    \'post_status\'    => \'publish\',
    \'posts_per_page\' => 12,
    \'tax_query\'      => array(
        \'taxonomy\' => \'category\',
        \'field\'    => \'slug\',
        \'terms\'    => \'x\',
    ),
);

//Run the query
$the_query = new WP_Query( $args );
 if ( $the_query->have_posts() ) {
    while ( $the_query->have_posts() ) {
        $the_query->the_post();
        ?>
            <div>
                <a href="<?php the_permalink(); ?>"><?php the_post_thumbnail(); ?></a>
            </div>  
        <?php
    }
    wp_reset_postdata();
}