A tensor calculation unit and a use method, and a data processing apparatus and an operation method. The tensor calculation unit comprises a first multiply-add operator and a second multiply-add operator, which are cascaded, wherein the first multiply-add operator comprises a first input port, a second input port, a third input port and a first output port, the first input port, the second input port and the third input port are used for respectively receiving parameters A0, B0 and C, and the first multiply-add operator is configured to perform the calculation of D0 = A0 × B0 +C, and output a calculation result D0 at the first output port; and the second multiply-add operator comprises a fourth input port, a fifth input port, a sixth input port and a second output port, the fourth input port and the fifth input port are used for respectively receiving parameters A1 and B1, the sixth input port is coupled to the first output port so as to receive the calculation result D0, and the second multiply-add operator is configured to perform the calculation of D1 = A1 × B1 + D0, and output a calculation result D1 at the second output port. The tensor calculation unit can be infinitely extended and stacked.