While i am updateing the lead,i am facing some issue as i have many leads with same email,hence i want to update the lead using leadid which seems to not possible using Rest API
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Not being a coder myself I can't fully answer your question. A quick search in the blog posts in the Developers section suggests that this should be possible.
Take a look at this post: http://developers.marketo.com/blog/synchronizing-lead-data-changes-using-rest-api/
Lead ID is one of the default fields in the instance. To find all field names, have a look here: Field Names » Marketo Developers
Hope this helps at least a little.