Hi, I want to know that If I am changing color of my site and adding some pages and replaces them with old one page then it gives any effect on my sites SERP or indexing.
if the site is laid out better, and is valid html, it should help. you need to consider how google reads a website, but if it looks better it should convert anyway
Website layout is also a big thing to get good hits. Websites layout should be user friendly as well as search engine friendly. Every page should be in reach of user within 2 clicks. Search engine craws from left to right and up to down so we should try to put all out anchor links on upper left
Changing colors on your site should have NO affect on rankings. If you change anything about the pages themselves (<title>, <h1>, <h2>s, content of page, link text used to link to other page, navigation, footer links, etc.) you will likely affect your rankings. Your rankings could go up or down depending on the types of changes you make.