The invention relates to the field of communication, and discloses a method and system for determining an interference buffering area. The method comprises the following steps: carrying out testing on a system for which refarming is planned; determining a first signal to interference plus noise ratio (SINR) and a second SINR of the system according to testing results, wherein the first SINR is a downlink SINR of the system after network-wide refarming, and the second SINR is a downlink SINR of the system only after refarming of a target cell; and determining the target cell as the interference buffering area when a ratio of the second SINR to the first SINR is smaller than a preset threshold. The method and system provided by the invention has the advantages that the testing is carried out on the system for which the refarming is planned, so that interferences after frequency refarming can be reasonably estimated through testing data and network configuration parameters, and the interference buffering area can be further conveniently and rapidly determined.