diff --git a/lib/hexo/load_config.js b/lib/hexo/load_config.js
index 61e1132be6..258bdab0c7 100644
--- a/lib/hexo/load_config.js
+++ b/lib/hexo/load_config.js
@@ -26,6 +26,12 @@ module.exports = async ctx => {
   ctx.log.debug('Config loaded: %s', magenta(tildify(configPath)));
 
   ctx.config = deepMerge(ctx.config, config);
+  // If root is not exist, create it by config.url
+  if (!config.root) {
+    let { pathname } = new URL(ctx.config.url);
+    if (!pathname.endsWith('/')) pathname += '/';
+    ctx.config.root = pathname;
+  }
   config = ctx.config;
 
   validateConfig(ctx);
diff --git a/test/scripts/hexo/load_config.js b/test/scripts/hexo/load_config.js
index cd68a08779..a985db11ff 100644
--- a/test/scripts/hexo/load_config.js
+++ b/test/scripts/hexo/load_config.js
@@ -106,6 +106,27 @@ describe('Load config', () => {
     }
   });
 
+  it('handle root is not exist', async () => {
+    try {
+      const content = 'url: https://hexo.io/';
+      await writeFile(hexo.config_path, content);
+      await loadConfig(hexo);
+      hexo.config.url.should.eql('https://hexo.io');
+      hexo.config.root.should.eql('/');
+    } finally {
+      await unlink(hexo.config_path);
+    }
+    try {
+      const content = 'url: https://hexo.io/foo/';
+      await writeFile(hexo.config_path, content);
+      await loadConfig(hexo);
+      hexo.config.url.should.eql('https://hexo.io/foo');
+      hexo.config.root.should.eql('/foo/');
+    } finally {
+      await unlink(hexo.config_path);
+    }
+  });
+
   // Deprecated: config.external_link boolean option will be removed in future
   it('migrate external_link config from boolean to object - true', async () => {
     const content = 'external_link: true';