Website Redesign / Domain Migration: How to Avoid Losing Rankings?

Chapter 2: Search Fundamentals · Question 33

Redesigning a website or changing its domain is one of the riskiest operations in SEO. Done well, rankings transition smoothly or even improve; done poorly, years of accumulated traffic can drop to zero overnight. This article breaks down the entire process clearly so you know what to expect.

Before the Redesign: A Complete Preparation Checklist

A redesign doesn't start on "launch day." Prepare the following at least 2-4 weeks in advance:

1. Fully crawl the old site

Use Screaming Frog or export all URLs from the Sitemap to generate a complete list. Key items to record:

• All pages with rankings (export via Baidu Webmaster Platform or 5118)
• All pages withbacklinkspointing to them (via Ahrefs or Baidu Webmaster Platform backlink analysis)
• All high-traffic pages (export via Baidu Analytics)

2. Create a URL mapping table

This is the core file of the entire migration. The format is simple:

Principle: one-to-one mapping. Do not point multiple old pages to the same new page.

3. Pre-launch checks for the new site

• The new site's robots.txt do not accidentally block crawling
• The new site's sitemap generated and ready to submit
• The title, description, and H1 of new site pages retain the original optimized content
• The new site'sInternal linksstructure updated to the new URLs

301 Redirects: The Technical Core

301 A permanent redirect tells search engines "this page has moved permanently; please transfer the weight to the new address."

Configuration (Nginx example):

server {
    server_name old-domain.com;
    return 301 $scheme://new-domain.com$request_uri;
}

Common pitfalls:

• ✗ Using 302 temporary redirects instead of 301 (weight is not transferred)
• ✗ Redirect chains too long: A → B → C → D (each additional hop causes greater weight loss)
• ✗ Old pages return 404 directly without redirects
• ✗ All old pages point to the new site's homepage (this is effectively telling Baidu "all the old content is gone")

Baidu Search Resource Platform: Site Migration tool

Baidu provides a dedicated site migration tool. Path: Baidu Search Resource Platform → Site Support → Optimization & Maintenance → Site Migration.

Three migration methods are supported:

1. Domain change migration: full-site migration from old.com to new.com
2. Internal site migration (rules): URL structure changes, e.g. /article/123.html → /blog/123
3. Internal site migration (mapping): submit old-to-new URL mappings one by one

Steps:

1. Ensure all 301 redirects are live
2. Add and verify the new site in Baidu Search Resource Platform
3. Submit migration rules or URL mappings
4. Submit the new site's sitemap
5. Wait for Baidu review (processing typically begins in 1-2 weeks)

Expected migration timeline

Don't expect rankings to recover immediately after migration. The realistic timeline is:

• Weeks 1-2: noticeable ranking fluctuations; traffic may drop 20-50%
• Months 1-2: Baidu gradually recognizes the new URLs; rankings begin to recover
• Months 3-6: most pages return to pre-migration levels
• 6+ months: if the new site offers a better experience, rankings may surpass the old site

Note: The migration timeline above is areference estimate based on hands-on experience. Actual recovery speed varies with site size and scope of changes; these are not official statistics.

Key: Keep the old domain's 301 redirects for at least 1 year; do not shut them down early.

Monitoring priorities during migration

For the first 3 months after migration, check weekly:

• Baidu index volume changes (Site Owner Platform → Index Volume)
• Core keyword ranking fluctuations (5118 or manual monitoring)
• Crawling errors (Site Owner Platform → Crawling Exceptions)
• Whether 301 redirects are working properly (random spot checks on old URLs)
• Traffic recovery progress (Baidu Analytics comparison with same-period data)

If you find the index volume continuously declining for more than 4 weeks, immediately check whether any pages are missing redirects.

Practical recommendations

• Don't change the domain if you can avoid it: if you're only redesigning or changing the URL structure, try to keep the domain unchanged—the risk is much lower
• Roll out in batches: if the site has a large number of pages (10,000+), consider migrating in batches—migrate core channels first, and migrate the rest after observing stability
• Keep a backup of the old site: if something goes wrong, you need to be able to roll back quickly. Keep a complete database and static file backup of the old site for at least 3 months

Solve it with AI tools: preparation and monitoring before redesign/migration

Scenario 1: Scrape data from the old site to generate a "migration whitepaper"

I want to migrate my website from old.com to new.com. I have all the URLs of the old site (paste the URL list), the title and keywords of each page, and the traffic data exported from Baidu Analytics. Please help me: 1) generate a "migration whitepaper" listing high-traffic pages, pages with backlinks, and pages with core keywords; 2) mark the list of pages that must be prioritized for 301 redirects; 3) provide a complete migration preparation checklist (crawling → mapping → launch → monitoring).

Scenario 2: Batch-generate an old-to-new URL mapping table

The old site URL list is as follows (paste), and the new site uses [rule, e.g., domain changed to new.com, /news/abc.html changed to /blog/abc]. Please generate the corresponding new URL for each old URL and output a CSV (old URL, new URL), following these rules: one-to-one, no chains, and not all pointing to the homepage. Separately flag entries whose semantics don't match for me to confirm.

Scenario 3: Generate a migration monitoring checklist and automation script ideas

I'm executing a website migration next week. Please give me: 1) a weekly checklist for the first 4 weeks after migration (index volume, rankings, crawling errors, 301 effectiveness, traffic comparison, with how to check each item); 2) a script idea that can periodically check "whether old URLs' 301 redirects are effective" (can use Python/curl to check return codes and redirect targets).

Scenario 4: Write a site owner platform feedback statement related to the migration

I'm submitting a "website redesign" application on Baidu Site Owner Platform and need to write a statement. My situation is [migrating from an old domain to a new domain, changed the URL structure, 301 redirects already configured]. Please help me write a formal, clear redesign statement including: reason for the redesign, migration scope, 301 configuration status, and expected processing time. Keep the tone objective and professional.

Note: the boundaries of AI

• AI can only guess the migration mapping: the new URL correspondences it generates based on "semantic similarity" may point important pages to the wrong place—high-traffic/high-backlink pages must be confirmed manually one by one
• AI-generated scripts must be tested: run the monitoring script locally on a small scale first before putting it on the server—don't execute it for the first time in the production environment
• The redesign statement must be based on facts: it's fine for AI to help you polish the wording, but the specific details about your website (when it was changed, what was changed) must be filled in truthfully