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1. Link text
Link text contains keywords, keywords and search terms are the same or similar.
2. Placement of links
The head is heavy, the middle abdomen is second, the footer is lightest, the middle abdomen from make to right weight decreases successively.
3. Link Page pr
The higher the PR, the more valuable the link.
4. Link site Trust (TrustRank)
The higher the trust of a linked web site, the more valuable the link is.
5. Link Way (text link, picture link, or JS link)
Text link > Picture link >js link (JS link only a small portion can be crawled by Google)
6. Link existence time length
Links are too short to be known by Google as speculative behavior, the weight will be reduced.
7. Use of nofollow
With nofollow, links are not crawled by the engine.
8. Link and linked page content relevance
The stronger the correlation, the higher the link value.
9. Relevance of linked and linked web pages
The higher the correlation, the higher the value of the link.
10. Link and link Wrapping text dependencies
The higher the link and link wrap text dependencies, the higher the link value.
11. Two sites were previously linked
If there is already a link, then the link value will be reduced.
12. Host IP
If both sites are under the same host IP, the link value is lowered.
13. Registration Information
If the two domain registration information is similar, the link value will be reduced.
Reprinted from the MBA On-the-job graduate network http://www.inter-mba.org