A blood pressure parameter detection method, comprising: detecting, by user equipment UE, an electrocardiogram ECG signal of a user by using a first ECG contact and a second ECG contact that are connected to an ECG detection circuit of the UE, wherein the first ECG contact and the second ECG contact form a pair of detection electrodes; obtaining an absolute value of an electric potential difference by processing a feature signal extracted from the detected ECG signal or obtaining an amplitude-time waveform graph of the detected ECG signal, only when determining that the obtained absolute value of the electric potential difference matches an electric potential difference extracted from a prestored reference ECG signal, respectively, only when determining that the obtained amplitude-time waveform graph matches an amplitude-time waveform graph of the prestored reference ECG signal, enabling, by the UE, a photoplethysmogram PPG detection circuit, and detecting a PPG signal of the user by using a PPG detection point connected to the PPG detection circuit, obtaining an absolute value of an amplitude difference by processing a feature signal extracted from the detected PPG signal or obtaining an amplitude-time waveform graph of the detected PPG signal; and only when determining that the obtained absolute value of the amplitude difference matches an amplitude difference extracted from a prestored reference PPG signal, respectively, only when determining that the obtained amplitude-time waveform graph matches an amplitude-time waveform graph of the prestored reference PPG signal, enabling, by the UE, a blood pressure detection application, and processing the detected ECG signal and the detected PPG signal by using the blood pressure detection application to obtain a blood pressure parameter of the user. detecting, by user equipment UE, an electrocardiogram ECG signal of a user by using a first ECG contact and a second ECG contact that are connected to an ECG detection circuit of the UE, wherein the first ECG contact and the second ECG contact form a pair of detection electrodes; obtaining an absolute value of an electric potential difference by processing a feature signal extracted from the detected ECG signal or obtaining an amplitude-time waveform graph of the detected ECG signal, only when determining that the obtained absolute value of the electric potential difference matches an electric potential difference extracted from a prestored reference ECG signal, respectively, only when determining that the obtained amplitude-time waveform graph matches an amplitude-time waveform graph of the prestored reference ECG signal, enabling, by the UE, a photoplethysmogram PPG detection circuit, and detecting a PPG signal of the user by using a PPG detection point connected to the PPG detection circuit, obtaining an absolute value of an amplitude difference by processing a feature signal extracted from the detected PPG signal or obtaining an amplitude-time waveform graph of the detected PPG signal; and only when determining that the obtained absolute value of the amplitude difference matches an amplitude difference extracted from a prestored reference PPG signal, respectively, only when determining that the obtained amplitude-time waveform graph matches an amplitude-time waveform graph of the prestored reference PPG signal, enabling, by the UE, a blood pressure detection application, and processing the detected ECG signal and the detected PPG signal by using the blood pressure detection application to obtain a blood pressure parameter of the user.