This papers describes that metadata harvesting for Digital preservation its provides indexes or harvests metadata from different archives and digital documents to be made as institutional repositories .The functions and creations of metadata into different facets and the Dublin Core metadata initiatives an information community supported by OCLC has led to the development of metadata components that enhance cross disciplinary resource discovery. It is also provides some of the international level meta data harvester and web portal on  knowledge Harvester @NSA open gate, SJPI cross journal search service, SEED ( Search engine for Engineering Digital repositories) PKP ( Public Knowledge Project).

Keywords: Metadata; Digital preservation; Dublin core; OAI-PMH; PKP; SEED.c