For B2C enterprises, the efficiency and quality of the storage determines some key factors such as service level and customer satisfaction. In this paper, we present a solution to the multi-robot system with highly dynamic environment based on dispatching rules against the background of B2C mobile-robotic warehouses logistics system. With multi-task for multi-station in one work circle outbound task mode, series dispatching rules which are suitable for dynamic warehousing environment are proposed, including shelf selection rules and task selection rules. Through some simulation experiments using AlphabetSoup software, we study the effects of different warehouse scale and different number of robots on the combined strategy. The numerical results show the validity of the combined strategy.