A method for determining a control parameter of a cancellation branch (12, 52), comprising: inputting a first direct current bias signal to the cancellation branch (12, 52), and inputting a first excitation signal to a self-capacitance detection branch (11, 31), wherein a rear-end processing circuit (13, 33, 53) at least performs differential processing for an output signal of the cancellation branch (12, 52) and an output signal of the self-capacitance detection branch (11, 31) to obtain a first output signal; obtaining, based on the first output signal, a sum of phase delays generated by the self-capacitance detection branch (11, 31) and the rear-end processing circuit (13, 33, 53) in response to the first excitation signal; inputting a second direct current bias signal to the self-capacitance detection branch (11, 31), and inputting a second excitation signal to the cancellation branch (12, 52), wherein the rear-end processing circuit (13, 33, 53) at least performs differential processing for the output signal of the cancellation branch (12, 52) and the output signal of the self-capacitance detection branch (11, 31) to obtain a second output signal; obtaining, based on the second output signal, a phase delay generated by the rear-end processing circuit (13, 33, 53) in response to the second excitation signal; and obtaining the control parameter of the cancellation branch (12, 52) based on the sum of the phase delays and the phase delay generated by the rear-end processing circuit (13, 33, 53) in response to the second excitation signal, wherein the control parameter of the cancellation branch (12, 52) is used in touch control detection to at least cancel an original reference value of a to-be-detected self-capacitor that is formed between the self-capacitance detection branch (11, 31) and a system ground. inputting a first direct current bias signal to the cancellation branch (12, 52), and inputting a first excitation signal to a self-capacitance detection branch (11, 31), wherein a rear-end processing circuit (13, 33, 53) at least performs differential processing for an output signal of the cancellation branch (12, 52) and an output signal of the self-capacitance detection branch (11, 31) to obtain a first output signal; obtaining, based on the first output signal, a sum of phase delays generated by the self-capacitance detection branch (11, 31) and the rear-end processing circuit (13, 33, 53) in response to the first excitation signal; inputting a second direct current bias signal to the self-capacitance detection branch (11, 31), and inputting a second excitation signal to the cancellation branch (12, 52), wherein the rear-end processing circuit (13, 33, 53) at least performs differential processing for the output signal of the cancellation branch (12, 52) and the output signal of the self-capacitance detection branch (11, 31) to obtain a second output signal; obtaining, based on the second output signal, a phase delay generated by the rear-end processing circuit (13, 33, 53) in response to the second excitation signal; and obtaining the control parameter of the cancellation branch (12, 52) based on the sum of the phase delays and the phase delay generated by the rear-end processing circuit (13, 33, 53) in response to the second excitation signal, wherein the control parameter of the cancellation branch (12, 52) is used in touch control detection to at least cancel an original reference value of a to-be-detected self-capacitor that is formed between the self-capacitance detection branch (11, 31) and a system ground.