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I created a SharePoint List using Visual Studio 2013 and deployed it.

Later I had need to add few more columns in the List. So after adding more columns when I deployed it again then what I realized is all the SharePoint ListItems were removed automatically.

I want to know how we can deployed a SP List again without any data loss.

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What you want to do is use the Feature Upgrade mechanism to add the columns to the already existing list.

If you just re-deploy the feature without "upgrading", then yes, the existing list will be overwritten with a new, blank list.

Here is some documentation on MSDN about Feature Upgrades.

Here is a series of blog posts by Chris O'Brien about Feature Upgrades.

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