As grocery shopping shifted from traditional to online environment, consumer logistics that shoppers once completed
by themselves has been undertaken by E-Grocers(Online Grocers). Consequently the principal-agent relationship is built between
online shoppers and E-Grocers due to the information asymmetry. The Principal-Agent Problem in this context was identified and
explained by using the principal-agent theory and a mathematical model was constructed. The results indicate that ,when the
surplus benefit is nearly dependent on online shoppers completely, e-grocers will make effort to reduce logistics cost , improve
logistics services and avoid the moral hazard on the conditions of building a thorough evaluating system for the service quality of
consumer logistics and an effective incentive mechanism, redesigning a coordination mechanism and cultivating an e-grocery
shopping market with the development of online grocery shopping market and consumer logistics outsourcing market .