The invention relates to a placing method of a hot data copy in a cloud storage system. The placing method of the hot data copy in the cloud storage system comprises the following steps: classifying the files through the reading and writing numbers; and selecting appropriate files with higher hot to increase the number of copies to balance the load of the storage nodes. By means of the placing method of the hot data copy in the cloud storage system, the communication cost of the internal system is reduced, and the overall performance of the cloud storage system is improved. The principle of the placing method of the hot data copy in the cloud storage system is making a record according to the access condition in a recording period, and adding additional temporary copies according to the appropriate hot files selected from the records. The placing method of the hot data copy in the cloud storage system disclosed by the invention can effectively control the consumption caused by the sharp rise of the hot of part files when the extra cost is avoided as much as possible.