Home-garden-system is an ecosystem of different kind and a common feature of most suburban landscape in many rice farming tropical countries. If these kinds of ecosystems are well maintained, well-developed and used most sustainably; they can contribute a lot to the conservation of biological diversity by lessening the destructive use of the few nature reserves and forest ecosystems remaining. This paper presents home-garden systems in Manipur (in North-eastern part of India) and its importance in conservation of biodiversity.