How to find bad link for my website

1) First check your site content which have user friendly and high quality one?
2) Now turn your eyes into Google Webmaster Tools
3) Track every links that you linking with them , if there is any unnecessary or irrelevant link is there try to remove
4) Optimize your Title, Meta description and keywords for each page
5) Make sure that all your pages are indexed by search engines
6) Check your sitemap too

Now wait for some days, automatically you can see the improvement on SERP

 

1) Collect your site backlinks with back link tool;
2) Sort out all bad links (the ones that come from spammy, irrelevant, low-quality websites);
3) Disavow these links.

Here is a detailed guide on that: http://webmeup.com/seo-guide/get-rid-of-low-quality-backlinks.html