Internal Linking: How to Do It and the Underlying Logic of Authority Flow

Chapter 2: Search Fundamentals · Question 25

backlinksHard to acquire, but internal links are entirely within your control. Understanding the authority flow logic behind internal links lets you significantly improve key page rankings at the lowest cost.

The Underlying Principle of Internal Links: PageRank Flow

Search engines imagine each page's "authority" as a bucket of water. When page A links to page B, A gives a portion of its water (authority) to B.

Core rules:

• The more links, the less authority each one receives— a page with 10 outbound links gives 1/10 of its authority to each link
• High-authority pages pass more value— the homepage is usually the highest-authority page on the entire site
• Authority can pass through multiple layers— A → B → C, C can also indirectly receive part of A's authority

This is whyinternal link structure determines how authority is distributed within your site。

Internal Link Architecture Model: Hub-and-Spoke (Topic Cluster)

The most effective internal linking model today is **Topic Cluster**. Take this site's "100 Questions on Organic Marketing in China" as an example — it's a ready-made, solidly built case:

                  [/100wen/ 目录页 · 支柱页面]
                 /          |          |          \
            SEO 集群     GEO/AEO 集群   内容营销集群    平台矩阵集群
         （关键词研究、   （结构化数据、   （选题、      （小红书、
          技术 SEO…）     AI 引用…）      内容矩阵…）     微信、知乎…）

• Pillar page：/100wen/ Directory page, the site-wide hub, linking to all 101 articles
• Subtopic pages: each Q&A plus its corresponding tag aggregation page (/tags/seo/、/tags/geo/ and 16 other topic entry points)
• Bidirectional links: the directory page links to each article; each article's body also cross-references other related Q&As via internal links, pointing to each other

The benefit of this structure: search engines can crawl the entire site by following links, and at a glance see which articles support topics like "SEO"“GEO"“content marketing" —topic coverage depthis clearly visible, and authority concentrates toward core pages along these links.

Authority Differences of Internal Links by Position

Not all internal links carry the same authority:

Conclusion: The most valuable internal links are those that appear naturally in the body text and are contextually relevant.

This site lays them out according to exactly this priority: in the body text, internal links with dashed underlines serve as "editorial recommendations"; at the top there is a "Home > 100 Questions > Chapter" breadcrumb; and on the left there is a full-book table of contents sidebar (equivalent to an enhanced "related articles" navigation). The three positions each play their own role—they don't dilute each other, and they let both crawlers and users navigate the whole site.

The importance of anchor text

Anchor text (the clickable text of a link) directly tells search engines "what the linked page is about."

✗ Wrong approach:想了解更多，请<a>点击这里</a>

✓ Correct approach:这个话题展开之前，可以先看<a>什么是搜索意图</a>和<a>内链怎么做</a>

The internal link anchor text in this site's body text is basically all like this—directly using the target article's title or core concept (such as "What is GEO""Keyword"), rather than empty phrases like "click here“more."

Anchor text principles:

• Use descriptive text that contains the target page's coreKeyword
• Avoid repeating exactly the same anchor text (it looks unnatural)
• Anchor text length of 4-10 characters is ideal

Internal link audit: finding problems

Regularly check your internal link structure and watch for the following issues:

Orphan pages

Pages with no internal links pointing to them. Search engines have a hard time discovering them, let alone ranking them.

Excessive crawl depth

If an important page requires more than 5 clicks from the homepage to reach, search engines may not crawl it frequently.

Links pointing to dead pages

Internal links pointing to 404 pages waste the value being passed.

Audit tools：Screaming Frog (the free version is enough for small and medium sites), and 5118's on-site analysis feature.

Practical internal linking rules

1. Important pages reachable within 3 clicks：Starting from the homepage, any core page can be reached within a maximum of 3 clicks
2. Add internal links immediately after publishing new content：Add links from 2-3 related old articles pointing to the new article
3. 3-5 internal links in the body text is ideal：2-3 contextual internal links per thousand words; don't overdo it
4. Breadcrumb navigation is a must：This site is 首页 > 100问 > 搜索基础篇—it both helps users navigate and conveys structural signals
5. Regularly clean up dead links：Scan once a month with a tool, fix or remove internal links pointing to 404s

Practical recommendations

• Draw a map of your site's internal links：Crawl the entire site with Screaming Frog, export the internal link data, identify which important pages lack internal link support, and prioritize adding body-text internal links pointing to them
• Every time you publish a new article, find 3 old articles to add internal links：This is the simplest daily habit—after publishing a new article, search for related content on the site and naturally add links pointing to the new article in old articles
• Check how many internal links point to your "money pages"：Product pages, service pages, and conversion pages are the pages you most want to rank, so make sure they receive the most internal link support