Disclosed are a system and a method for managing excessive distribution of memory. Based on a page sharing technology, the software types of virtual machines running in respective servers in a cluster are collected, and the virtual machines with similar running software types are migrated from a server to a specified server, so that the page sharing effect of the virtual machines and the excessive distribution effect of memory are better, the bearing capability of the servers in the system is ensured not to be wasted, the utilization rates of memory and resources of the whole system are combined optimally, and the memory of the whole cluster system is distributed better; moreover, a fewer number of servers run, the energy and the running cost are saved, less pressure is caused to the environment, the emission of carbon dioxide is reduced, therefore, the disclosure has a great social effect and economic effect.