Hi Ankit,
If you are going to use Webi as a reporting tool then you need to create Universe on top of HANA.
Please see below link will help you to understand reporting on HANA as a database.
http://events.asug.com/2012AC/0309_HANA_Connectivity_and_Best_Practices_with_SAP_BusinessObjects.pdf
FAQ about SAP BI4 WebIntelligence on HANA
~Anuj