Abstract: A method for effectively transmitting data, in which a switch is connected between a plurality host and storage, comprises steps of the following. First, the hosts recognize the storages via the switch, and revise a data transmission path within an original command, meanwhile transforming it into a specific command. Later, the switch receives the specific command, alternatively revises the data transmission path or not, and transforms the specific command into a standard command. The standard command is then transmitted to the storage. After receiving it, the storage is able to search for a corresponding host based on the data transmission path such that data is simply transmitted between the storage and its corresponding host. By employing the proposed method, the present invention is beneficial to reducing system complexity and raising data transmission efficiency.