在/wp-includes/media.php的_wp_image_editor_choose函数内部找到：

[php]
$implementations = apply_filters( ‘wp_image_editors’, array( ‘WP_Image_Editor_Imagick’ ,  ‘WP_Image_Editor_GD’ ) );
[/php]

修改为：
[php]
$implementations = apply_filters( ‘wp_image_editors’, array(  ‘WP_Image_Editor_GD’ ,’WP_Image_Editor_Imagick’ ) );
[/php]