An image-forming apparatus, comprising: a first motor, configured to rotate a first photosensitive part; a second motor, configured to rotate a second photosensitive part; a first phase sensor, configured to detect a first rotation phase of the first photosensitive part; a second phase sensor, configured to detect a second rotation phase of the second photosensitive part; and a control unit, configured to, after at least one page of image-forming job is received and at least one of the first motor and the second motor receives a phase match instruction, perform phase match on the first photosensitive part and the second photosensitive part according to a rotation phase of a photosensitive part corresponding to a motor receiving the phase match instruction, wherein the phase match instruction is configured to indicate that the phase match needs to be performed on the first photosensitive part and the second photosensitive part, wherein the control unit is configured to, when the first phase sensor detects a first preset phase signal, control the first motor to stop rotation after delaying a first variable time; and/or when the second phase sensor detects a second preset phase signal, control the second motor to stop rotation after delaying a second variable time, wherein after both the first motor and the second motor stop rotation, a phase difference between the first photosensitive part and the second photosensitive part is less than or equal to a preset phase difference threshold, characterized in that, when a print speed of the image-forming apparatus is a first print speed, the control unit is configured to use a third sub-variable time to perform a phase match operation on the first photosensitive part and the second photosensitive part; and when the print speed of the image-forming apparatus is a second print speed, the control unit is configured to use a fourth sub-variable time to perform the phase match operation on the first photosensitive part and the second photosensitive part, wherein when the first print speed is greater than the second print speed, the third sub-variable time is less than the fourth sub-variable time. a first motor, configured to rotate a first photosensitive part; a second motor, configured to rotate a second photosensitive part; a first phase sensor, configured to detect a first rotation phase of the first photosensitive part; a second phase sensor, configured to detect a second rotation phase of the second photosensitive part; and a control unit, configured to, after at least one page of image-forming job is received and at least one of the first motor and the second motor receives a phase match instruction, perform phase match on the first photosensitive part and the second photosensitive part according to a rotation phase of a photosensitive part corresponding to a motor receiving the phase match instruction, wherein the phase match instruction is configured to indicate that the phase match needs to be performed on the first photosensitive part and the second photosensitive part, wherein the control unit is configured to, when the first phase sensor detects a first preset phase signal, control the first motor to stop rotation after delaying a first variable time; and/or when the second phase sensor detects a second preset phase signal, control the second motor to stop rotation after delaying a second variable time, wherein after both the first motor and the second motor stop rotation, a phase difference between the first photosensitive part and the second photosensitive part is less than or equal to a preset phase difference threshold, characterized in that, when a print speed of the image-forming apparatus is a first print speed, the control unit is configured to use a third sub-variable time to perform a phase match operation on the first photosensitive part and the second photosensitive part; and when the print speed of the image-forming apparatus is a second print speed, the control unit is configured to use a fourth sub-variable time to perform the phase match operation on the first photosensitive part and the second photosensitive part, wherein when the first print speed is greater than the second print speed, the third sub-variable time is less than the fourth sub-variable time.