1. Domain Names
Domain names might be an issue. Due to the low cost of .cn domain names, many people buy large quantities of .cn domains to create spam websites, which affects the value of .cn domains in search engines and leads to fewer or no inclusions of .cn domain websites by Baidu.
2. Redirect and Refresh Issues
If you use a redirect in the header of a webpage to another page, this is considered cheating by search engines and can easily lead to reduced inclusion, or even complete removal from rankings!
3. Frequent Website Redesigns
Avoid frequently redesigning your website, such as often changing the homepage categories and titles. Baidu reacts slowly to these changes. I once made similar modifications to my site, moving content from a secondary directory to the root directory, but Baidu stopped including it. The previously included secondary directory content decreased while only the homepage of the root directory was indexed, and it remains so to this day. If you must change the program, I suggest completely shutting down your website for a month before re-uploading your program. This way, Baidu will treat it as a new site, making it easier to include.
4. Hosting Issues
The stability of the hosting space where the website resides is one of the important factors affecting inclusion. Poor inclusion of sites under the IP address of the server or unstable hosting can affect Baidu's inclusion!
5. Advertising Impact
Adding Ali Mama ads to your website indeed affects Baidu's inclusion. I also tried placing Ali Mama ads on my site, and as a result, the site was removed from rankings. After removing the Ali Mama ads, it was re-included the next day. After several trials, the same effect was observed each time.
6. Severe Template and Content Repetition
Be sure to modify templates downloaded from the internet before using them. Using identical templates with heavily copied content means that such websites will not be well-indexed.
7. Keyword Stuffing
Don't choose overly popular keywords. Even if they are initially included, they will soon be removed because Baidu believes that if it really includes your site, your traffic would increase significantly, which is like finding money falling from the sky. Too many stuffed titles and keywords will cause Baidu to reduce or stop inclusion!
8. SEO Optimization
Baidu’s punishment for over-optimized SEO websites is becoming increasingly severe. Excessive SEO optimization can lead to reduced or no inclusion by Baidu!
9. Website Links Are Important
Regularly check your external links to see if there are any unreachable websites, spam websites, websites not included by Baidu, or websites penalized or removed by Baidu. These will affect Baidu's inclusion, leading to reduced or no inclusion!