Cloud computing is the new emerging technology in the field of research and IT industries. So the demand for the computational power required by the business, web and scientific application are rapidly increased in recent past year. To fulfill this demand large scale data center are created which consume enormous amount of electric power. Energy consume by the data center can be reduced by minimizing the number of active server which is known as server consolidation and by the proper load balancing. To achieve the server consolidation and the load balancing VM (Virtual Machine) migration is used.