You can do this by adding a store view label in
Admin > Catalog > Attributes > Manage Attributes
Search for SKU, edit it and then under Manage Label / Options in your 'Admin' and 'Default Store View' (and any other store views you have) type Barcode.
Barcode type not available in Attributes-> input type
and i want to barcode in invoice like this
Ahh I see. For that you'll either need some custom coding or an extension. Have a search on Magento connect and see if anything pops up there.. otherwise someone else might be able to recommend something.
To make this feature, you need to customize Magento core. We are currenlty provide magento customize service. If you need, you can contact us through the link: http://www.magewoo.com/magento-services.html or send email via email@example.com.
Hope this helps.