The invention discloses a shifting fork control method during a DCT (Dual Clutch Transmission) speed changer downshift process. The shifting fork control method during the DCT speed changer downshiftprocess comprises the steps: (1) after a TCU receives signals from the accelerograph opening, the vehicle acceleration and the vehicle speed, the TCU sends a downshift command signal to a hydraulic system, the hydraulic system loads oil pressure on a hydraulic cylinder on the downshift starting side, and a shifting fork moves from the downshift starting side to a neutral position under the actionof the oil pressure; (2) when the shifting fork moves to an optimal oil pressure unloading position, the TCU sends a command signal, so that the hydraulic cylinder on the downshift starting side unloads the oil pressure; and (3) the shifting fork moves to the neutral position under the action of inertia so as to accomplish downshift operation. According to the shifting fork control method during the DCT speed changer downshift process provided by the invention, during the downshift process, the inertia displacement of the shifting fork is compensated through unloading the oil pressure at an advanced position, so that the problems that the downshift quality is poor and even the downshift operation is failed since the shifting fork cannot accurately move to the neutral position through shifting fork inertia during the downshift process are solved.