In the last decade, sharing economy, or its other names, has been discussed so much. Besides convenience and saving money, sustainable lifestyle and neighbor friendship are more beautiful things that sharing offers us. On the other side, it also leaves us full of confusion. Many researchers and entrepreneurs are arguing how to define it. In this research, I went through the beginning and evolution of sharing economy and give my own definition. Through case study of NeighborGoods, Peerby and Pumpipumpe, I summarized the valuable knowledge of their practice and some drawbacks that need to be overcome. After that, I started my user research in Helsinki student communities and understood how people there think about sharing. As an output, I made Shrgrp, a service that helps community members to share. Through all these design research and practice, I get to know how sharing are reforming our lifestyle, our relationship with neighbors and the community we are living
