An SAS RAID head is provided to connect between at least one initiator and at least one storage device. It is a connection head possessed of the RAID function. The SAS RAID head comprises at least one SVC (or a SVC pair), a cooling module, a power supply, and/or an enclosure for accommodating and fixing the above-mentioned components. Wherein, the device-side I/O device interconnect of the SVC (or SVC pair) is the SAS interface. The invention has the flexibility to vary the numbers of initiators and storage devices connected thereto in order to satisfy the topological structures of various systems.