在网站根目录的.htaccess文件里，最上面添加以下代码，如果没有.htaccess文件就自行创建一个。
RewriteCond %{HTTP_USER_AGENT} AhrefsBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} YandexBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} YandexImages [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} DotBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} MJ12bot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} RU_Bot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} Ezooms [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} PetalBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} Yeti [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} BLEXBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} Exabot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} YisouSpider [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} sandcrawlerbot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} ShopWiki [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} Genieo [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} Aboundex [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} coccoc [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} MegaIndex [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} spbot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} SemrushBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} TwengaBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} SEOkicks-Robot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} WordPress [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} SeznamBot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} BUbiNG [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} Barkrowler [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} serpstatbot [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} MegaIndex.ru [NC]
RewriteRule .* / [F]
RewriteCond %{HTTP_USER_AGENT} DataForSeoBot [NC]
RewriteRule .* / [F]