What do you do when you want to distribute or release source code that is stored in a Git repository? Obviously, if your target audience is using Git, you can just compress the directory that contains the repository and distribute the copies, or give the users a way to clone your repository (such as GitHub). However, your audience may not be Git users, or the hidden .git directory may be very large and you don’t want to distribute it. The solution is the git archive command, which packs the files from a tree-ish into an achive (ZIP or TAR). By “tree-ish”, they mean that you can specify a branch, commit, HEAD, etc. git archive is somewhat analagous to the svn export command. I find the most useful form of this command to be:
cd example
git archive --output ~/example.zip --format=zip --prefix=example/ HEAD
Do not forget the trailing slash after the directory that you specify with the --prefix flag!
REFERENCE: How to do a “git export” (like svn export)