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导致google搜索排名下降的因素（下）[英文]

Internal Links

1. Keywords - links that contain keywords should be related to the webpage they point to.
2. Titles - links should have titles that represent the anchor text of the link (tool tip).
3. Representation - link text should represent the linked page.

Recommendations

• You can place keywords within the anchor text of internal links but it is best to make sure they are relevant to visitors.
• Do not stuff your anchor text with tons of keywords.
• Keep the anchor text representative of the page you are linking to.
• Make the titles (tool tip) on each link the same as the anchor text.

Indexing

1. Links - by crawling all the links, all the pages of that website should be discovered and indexed.
2. Sitemap - a sitemap should contain links to important pages within a sitwebe.

Recommendations

• Link within your content to other pages within your website this can help Google index all of your pages.
• Create a sitemap that links to all or, at the very least, the important pages on your website.

External Links

1. Authority - if an authority website links to another website, then that other website will be considered valuable to people.
2. Keywords - if there are keywords within the anchor text of a link then it is normal for Google to consider that the website should be ranked for those keywords.
3. Age - the longer a link stays live on a website, the more valuable the link is.
4. Relevance - if a website links to you and another website, both websites, or at least web pages, should be related to the same topic.
5. Quantity - the more outbound links on a page, the less weight each link will have.
6. Extension - sites with important extensions such as .edu and .gov are considered to link to more valuable sites.
7. Freshness - if a site has outbound links and updates frequently, then even the old outbound links are considered to be valuable.
8. Link count - if a lot of websites link to one website, then that one website is considered useful to people.
9. Linking websites - links from related websites are better then links from non-related websites.
10. DMOZ - websites that are in DMOZ and link out to other websites are considered to link to good sites.
11. Placement - links within a website's content is considered better then links in the footer of a website.

Recommendations

• Try to get links from authority websites.
• Do not participate in link exchanges to build up your link popularity.
• Try not to purchase all page links.
• Do not go for links from high PageRank websites; instead go for links from related websites.
• Links from directories such as DMOZ and Yahoo Directory can not just help with search engine rankings but can also drive traffic.
• Use the new social websites such as MySpace, digg, del.icio.us, and YouTube to build link popularity.
• If you purchase text links try to keep them live as long as possible. The older the link, the better.
• Links from .edu or .gov websites will usually carry more weight and greater benefit.
• Stay away from websites and blogs that link out to non-related websites or that may seem spammy.

Code

1. Size - the size of the code on a website should be streamlined, the less KB it takes up, the better.
2. Clean - sites that are using web standards and have clean code usually load up faster for users.

Recommendations

• Use CSS to make your page size smaller.
• Use CSS to help improve the cleanliness of your code.

Website

1. Website Age - older websites are considered more relevant then newer websites.
2. Visit Length - in most cases the longer people stay on a website the great the chance that the website is useful to them.
3. Sandbox - websites in the Google sandbox are usually not as relevant compared to older websites.
4. 301 redirect - websites should do a 301 redirect from "yourdomain.com" to "www.yourdomain.com" or vice versa, depending on the circumstance.

Recommendations

• Try to register your domain name for more then 1 year.
• Use a 301 permanent redirect so that your website appears as 1 website instead of two separate websites. (www and the non-www are looked as two sites unless your do a redirect from one to the other)
• Try to grow at a natural rate; growing too fast may put you in the Google sandbox.

The following are some factors that Google may look at in a negative way:

1. Visibility - websites with invisible text might be trying to trick Google.
2. Over optimization - websites that are overly optimized may not be relevant for any search terms.
3. Keyword stuffing - websites with too many keywords stuffed into the content might be trying to trick Google.
4. Reciprocal links - websites that link between each other too many times might be trying to cheat.
5. Cloaking - websites that show Google a different page then what the viewer sees usually get banned.
6. Anchor text - if all the websites linking to a website have the same anchor text, those links will not be considered natural.
7. Doorway pages - if tons of 1 page websites filled with keywords are linking to another website, the ranking of that website can be affected negatively.
8. Frames - it is hard for Google to crawl and index a website with frames, which can make it harder to rank that website.
9. Flash - it is hard to read/crawl websites made fully in flash which will make it harder to rank Flash websites.
10. All page links - if tons of websites link to another website on every one of their pages then the text links may have been purchased, which is frowned upon by Google.
11. 301 redirects - websites that have tons of other websites redirecting into them might be trying to increase their link count to rank high, so Google may penalize these websites.

These are many of the factors that Google might look at when determining the ranking of a website. Each factor has a different weight and the weights are constantly changing to provide searchers with more relevant results. As Matt Cutts mentioned to Om Malik, Google "used to crawl the web once a month, and now we update everything in two to three days". This shows that it is important to make sure you account for as many of the ranking factors as possible, especially if you want to get ranked. One thing to note is that if you take these factors above and compare them to how a blog is setup, blogs are inline with most of these factors, especially when it comes to some of the biggest factors such as freshness of content.