The application discloses a method and a system for information synchronization between cloud storage gateways and a cloud storage gateway, to resolve a problem that an address obtained by a cloud storage gateway is usually a dynamic address or even a private address, and it is difficult to perform direct communication and impossible to perform directory synchronization. A cloud storage gateway obtains, from a cloud message queue of a cloud service provider, a directory distributed by another cloud storage gateway; and therefore, as long as the cloud storage gateway can communicate with the cloud service provider, directory synchronization can be implemented without a need of direct communication between the cloud storage gateways. Therefore, even through an address obtained by the cloud storage gateway is a dynamic address or a private address, directory synchronization is not affected.