您知道Google一共参考了多少个排名的原则么？在google的网站里面，Google自己承认超过100个，但是实际上呢？告诉各位绝对不是只有100个，举个例子，时间因素没有提，镜像因素没有提，重复问题没有提，网页结构没有提，中文的处理方式更不可能提了（其实google对中文的处理还是很幼稚的）......，其实Google绝对不会把他们的家底透漏出来，否则Google就不用混了。
各位可以在Google的网站里面找到以下他们承认的一些因素。
End User Features
• Google quality and ranking
For each queryGoogle factors in 100 variables including anchor text URL patterns fonts and positioning data to calculate relevance.
• Dynamic page summaries
Search result summaries contain dynamically generated snippets of text that show how your query was used on the page.
• Results grouping
Multiple results from the same subdirectory are grouped together making search results easier to read quickly.
• Automatic spellchecker
Google's self-learning spellchecker automatically detects misspellings and suggests corrections. Using technology developed by Google it is far more accurate than industry standard software.
• Cached pages
Caches copies of every page in your index so search results can be viewed when the original sites are down.
• Hit highlighting
Query terms are highlighted on cached pages allowing users to quickly find which parts of a page are relevant to their queries.
• View as HTML
Non-HTML search results are automatically reformatted as HTML enabling users a quick glimpse at the content without having to launch the original application in which the content was created.
• Sort by date
Enables users to get at time-sensitive information first. Dates can be identified in any international format.
• Advanced boolean search
Offers more than 10 special query terms for advanced search functionality and supports Boolean AND OR and NOT searches.
Administrator Features
• Web-based Admin Console
The admin console supports multiple logins and administrative roles for crawling serving and monitoring with an intuitive easy-to-use interface.
• Subcollections
Categorize searches according to URL patterns.
• Synonyms
Define synonyms for company-specific acronyms or terminology and have those terms be displayed as suggested alternative queries.
• Keymatch
Define matches between URLs and keywords so that the targeted URL displays above the main set of search results.
• Look and Feel
Search results customizable using XSLT stylesheets.
• Reporting
Web-based reports show daily and hourly result sets top queries special feature usage and more. Easily export the reports for use in other reporting tools.
• URL Tracking
Analyzes all crawled content and hosts making it easy for administrators to identify problematic servers errors and sources of content.
• Remote Diagnostics
Comes equipped with a modem connection for remote maintenance by Google support if necessary.
Enterprise Integration
• Web Servers
The Google Search Appliance maps all the web documents on your network accessible via hypertext transfer protocol (HTTP) in a process known as crawling then creates an index of those documents.
• Secure Search
The Google Search Appliance has the capability to crawl password-protected areas and HTTPs content. Secure information protected by basic authentication or NTLM is shown only to users who have access authorization.
• Proxy Servers
Crawls content located behind proxy servers.
• Lotus Domino
Fast efficient crawling of Lotus Domino servers.
• Meta Tags
Supports standard meta tag fields enabling search narrowing and filtering based on meta tag values. Also can return meta tag data for display in search results.
• File Types
Search more than 200 file types including HTML Microsoft Office™ PDF PostScript WordPerfect Lotus and many others.
• Languages
Able to restrict searches to any one of 28 languages.
实际上，几乎每个月Google都在改变算法，如果没有坚持每个月都深入了解，不出三个月就被Google剔出搜索引擎专家的行列了，这也是为什么国内没有几个人愿意深入研究的原因了。
