The search engine work principle's ranking big revelation

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Many seo-er should understand the search engine works a variety of complex, roughly generally divided into three big strides: crawling and crawling, build index and rankings. Of course Seo-er optimize the site, the goal is to improve keyword rankings, increase product exposure rate. To this end, Seo-er more value ranking this link, the author of the search engine work principle of the ranking to do a small experience.

Most of the users in the search engine are returning a list page by typing a keyword, which is built with a large number of search index libraries. Of course this page here refers to the natural search results. So how did the search engine complete the rankings? We have no harm in looking at the whole mind map.

Analysis of submitted search requests

Search for users to type keywords in search engines, submit search requests, step by step to find a matching page display. When we type the keyword Submission (press ENTER) to the search engine, the search engine will make a detailed analysis of this request.

1. Chinese participle

Chinese word segmentation is an important part of the major search engines, Chinese word segmentation can more clearly grasp the focus of the search request, time better to show the page to search users.

Baidu Chinese participle common in the following three kinds:

A, based on string matching

It is more common to three kinds, which are based on the positive and maximum matching method of string matching, the reverse maximum matching method and the least segmentation.

Forward maximum matching method: The use of keyword query, Baidu ranked first in the title and search for the long tail of the word in accordance with the site, the condition is quite the case, first show the title matching page.

Inverse maximum matching method: Just the opposite rule of the positive maximum matching method, that is, to split and combine from right to left.

Minimum segmentation: The smallest segmentation is to cut a phrase into the most refined, and most of them will appear in a word.

B, understanding the method of Word segmentation

Understanding the method of Word segmentation: Search engine simulates people's thinking, the understanding of its sentence segmentation technology. By the integration of stored words and sentences, the word segmentation is understood. The basic idea is to make syntactic and semantic analysis at the same time, and use syntactic and semantic information to deal with ambiguity. It usually consists of three parts: the segmentation subsystem, the syntactic system, the general control part. Under the coordination of the general control part, the segmentation subsystem can get the syntactic and semantic information about words and sentences to judge the ambiguity of word segmentation, that is, it simulates the process of human understanding of sentences.

C, Statistical participle method

The number of adjacent words appear at the same time, Chinese participle will probably appear adjacent to the word as you a word. We often do not use bold, bold these? The reason is that this is also good for search engine understanding.

2, remove the stop word

Search users in typing keywords, more or less will appear a lot of stop words, like "", so as to maximize the display of the most relevant, most can meet the user experience results page.

3, processing symbols

Search engines still value punctuation, so we seo-er in editing the article, we should pay attention to the reasonable use of punctuation, especially in the title of the article.

Ii. Matching Search Requests

When the search engine received a detailed analysis of the search request, it will match the URL (of course, the focus is the title and summary fragment), matching the URL of tens of thousands of, how to display the order, which requires search engines by URL matching degree ranking.

Third, the matching page ranking

To match the page sort, in fact, is the search engine to match the page to screen, select the process, and then in a certain order to organize the behavior of the structure. Of course, the search engine will give each page a value, that is, the weight (seo-er), by judging the Web page on the search engine and the value of the user experience ranking. The factors that improve the ranking are various, at present basically refer to hits algorithm, TrustRank Trust index algorithm, PR value and so on.

The author is more superficial to talk about personal views, do not know what seo-er have ideas, may wish to supplement the exchange. For network optimization personnel, must fully understand and Master search engine work principle, but many seo-er know too little, hope everybody with progress, with forward-looking.

Article by Chongqing SEO (http://www.seoread.org/post/rank-principle.html) prepared, reproduced in the form of links to indicate the source.