因为站点不需要显示这么多图片，只需要原图就OK了，所以就要修改下媒体设置。打开设置->媒体，将不需要的缩略图宽度高度都设置为0就可以了。如下图：
但是这样设置之后，还是会生成其它分辨率的缩略图，笔者猜测应该是主题的问题，于是就去主题内查找，笔者用的主题是themolio。后来在主题文件的functions.php中找到了这样的代码：
function themolio_setup() {</p>
<p> /* Make Themolio available for translation.
* Translations can be added to the /languages/ directory.
* If you're building a theme based on Themolio, use a find and replace
* to change 'themolio' to the name of your theme in all the template files.
*/
load_theme_textdomain('themolio', get_template_directory().'/languages' );
add_editor_style();
add_theme_support('automatic-feed-links');
add_theme_support('post-thumbnails');</p>
<p> /**
* This sets up the image size for the grid based top-down layouts (with no sidebar).
* If you change the width/height of your content,
* you will have to modify the width and height mentioned below as well
*/
add_image_size('themolio-two-col-grid-image-nosidebar',460,300,true);
add_image_size('themolio-three-col-grid-image-nosidebar',290,200,true);
add_image_size('themolio-four-col-grid-image-nosidebar',210,150,true);</p>
<p> /**
* This sets up the image size for the grid based top-down layouts (with sidebar).
* If you change the width/height of your content,
* you will have to modify the width and height mentioned below as well
*/
add_image_size('themolio-two-col-grid-image-sidebar',356,250,true);
add_image_size('themolio-three-col-grid-image-sidebar',230,150,true);
add_image_size('themolio-four-col-grid-image-sidebar',171,110,true);</p>
<p> /**
* This sets up the image size for the featured image.
* If you change the width/height of your content,
* you will have to modify the width and height mentioned below as well
*/
add_image_size('themolio-featured-image',800,300,true);</p>
<p> register_nav_menu('primary', __('Primary Menu', 'themolio'));</p>
<p> add_theme_support('post-formats', array('link', 'gallery', 'status', 'quote', 'image', 'video'));</p>
<p> if(themolio_is_wp_version('3.4')) {
add_theme_support('custom-background');
} else {
add_custom_background();
}
}
</div>
其中add_image_size就是增加缩略图设置的方法，根据需要注释掉即可。其它主题也可以依此类推，只要搜索关键词add_image_size，应当就能找到缩略图的设置。
最后生成多张缩略图的问题就搞定了。
友情提示
如果日后有需要缩略图，可以在媒体->媒体库->选择需要的图片点编辑->编辑图片，然后就可以裁剪图片了。最后报下wordpress和使用主题的版本：
wordpress是3.4.1版本
主题是Themolio，版本是1.2