A transmitting system, the device and the method for the remote bus applies to control the remote device via network. The transmitting system comprises of a main computer and a bridge device. The main computer includes a first process unit, a storage unit, a first network port and an agent program. The first process unit dispatches the agent program, and sets up the address space and the connection channels according to the identify information. The bridge device couples to the main computer and the target device. The agent program divides the operation command and generates the first package. The main computer sends the first package to the bridge device via the first network port. The bridge device recovers the first package to the operation command, and drives the target device according to the operation command.