Abstract: Regarding the problem of selecting target physical servers when migrating multi-component application systems to the cloud,a migration method based on the inter-component communication amount was proposed．According to the formalization of the application system logical architecture and cloud platform physical resources organizational structure,the method is to select target physical server for each system component by calculating the communication amount and virtual resource requirements of them．By the experiment of migrating multi-tenancy excellent course websites system to Bingo Cloud,the result shows that the migration method can reduce the traffic between physical servers of the cloud platform.

Key words: Cloud computing,Application system,Migration,Component,Communication