The invention provides a combined tri-state overrunning clutch which comprises a unidirectional overrunning clutch and a tri-state overrunning clutch which are combined together. The two clutches share the same outer ring and the same inner ring; the wedging directions of the wedges in the two clutches are opposite. The unidirectional overrunning clutch is provided with the unidirectional overrunning state and the joint state; the tri-state overrunning clutch is provided with the unidirectional overrunning state, the joint state and the bidirectional separation state. Accordingly, the combined tri-state overrunning not only has the operating states of a common unidirectional overrunning clutch, but also has the bidirectional separation state and the bidirectional joint state; thereby, the tri-state overrunning clutch is in the overrunning or joint state.