A method, an apparatus, and a system for adjusting a deployment location of a virtual machine in order resolve a problem that an inter-node communication cost has excessively great impact on an adjustment result in an existing solution for adjusting a deployment location of a virtual machine in a cloud computing system, the inter-node communication cost is corrected according to technical solutions provided in the embodiments of the present disclosure. Consequently, not only a corrected inter-node communication cost can exert impact on the result for adjusting a deployment location of a virtual machine, but also communication traffic can play a major role in affecting the adjustment result. Therefore, a more appropriate result for adjusting a deployment location of a virtual machine can be obtained, and bandwidth consumption inside the cloud computing system can be reduced.