how to index backlinks of website?

There are many different ways of indexing backlinks of a website. One way is to use the Open Site Explorer tool which queries Google and Yahoo for all indexed pages on a site that are indexed by their search engines. This is a good way if you want the total number of pages indexed by each search engine without going directly to the sites themselves and downloading all the raw data yourself. The downside is that this method only counts external links, not internal links (such as from one page on your site to another) or adding in anchor text in addition to referring URLs, which means it doesn't get an accurate representation of total backlink profile accurately.

You may use Sitemap to submit the pages of your own website to the searchengines so that those are quickly indexed by the search engines.

There are several SEO benefits of indexing your backlinks. First, it will have a large positive impact on your website's performance in search engine results pages (SERPs). Second, your brand's reputation will be improved --backlinks from trusted websites tell search engines that your site is trustworthy and will help improve search rankings. By submitting a sitemap to Google Webmaster Tools or Bing Webmaster Tools you are telling these search engines about changes on your site so they can crawl it more efficiently.