i want to remove archieves section in my blog and give a separate link to my each post.Will that change effect my search engine placement?
Yes, it can help you. If you're using a blog like Wordpress, you should use your robots.txt file to exclude spiders from your archives, categories and tags pages. Otherwise, it will look like duplicate content, which isn't good. Instead, you should have a good internal link structure which links appropriately to each original page of content on your site.