The invention relates to a method for accessing a distributed object storage system through a mode of designing a local cache in a client under the architecture of the distributed object storage system. The method comprises a reading operation: when reading the object file data of the distributed object storage system, firstly, searching an object file in the local cache of the client, if the object file is not searched in the local cache, reading the object file from the distributed object storage system, storing in the local cache system of the client, if the object file is searched in the cache, not reading the object file from the distributed object storage system; writing operation: when writing object field data in the distributed object storage system, firstly writing the object file data in a local cache, after finishing writing, marking that the object file is not synchronized, returning, and then writing the object file data written in the local cache in the distributed object storage system by a cache synchronous service module. Through the invention, the number of access times to the distributed object storage system can be reduced; the I/O throughput of accessing the file system by the virtual machine is improved; and the response time of an access request is reduced.