A photoplethysmography based control method, applied to an electronic device comprising a PPG module, the PPG module comprising a plurality of light-emitting diodes LEDs and a plurality of photodiodes PDs, wherein the method comprises: using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a first current; using, by the electronic device, at least one of the plurality of PDs to obtain a second current returned by the light signal corresponding to the first current via a human tissue; and reducing, by the electronic device, the first current by using a preset first current step size when the electronic device determines that the second current is greater than a target current; or increasing, by the electronic device, the first current by using the preset first current step size when the electronic device determines that the second current is less than the target current; wherein before the using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a first current, the method further comprises: receiving, by the electronic device, a second operation, wherein the second operation is used to indicate start of monitoring of human body characteristics; in response to the second operation, using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a fifth current; and using, by the electronic device, at least one of the plurality of PDs to obtain a sixth current returned by the light signal corresponding to the fifth current via the human tissue; and the using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a first current comprises: using, by the electronic device, the plurality of LEDs to emit the light signal corresponding to the first current, when the electronic device determines that the sixth current is greater than or equal to a first preset current; characterised in that the method further comprises: displaying, by the electronic device, first prompt information when the electronic device determines that the sixth current is not greater than or equal to the first preset current, wherein the first prompt information is used to indicate that wearing of the electronic device has not been detected. using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a first current; using, by the electronic device, at least one of the plurality of PDs to obtain a second current returned by the light signal corresponding to the first current via a human tissue; and reducing, by the electronic device, the first current by using a preset first current step size when the electronic device determines that the second current is greater than a target current; or increasing, by the electronic device, the first current by using the preset first current step size when the electronic device determines that the second current is less than the target current; wherein before the using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a first current, the method further comprises: receiving, by the electronic device, a second operation, wherein the second operation is used to indicate start of monitoring of human body characteristics; in response to the second operation, using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a fifth current; and using, by the electronic device, at least one of the plurality of PDs to obtain a sixth current returned by the light signal corresponding to the fifth current via the human tissue; and the using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a first current comprises: using, by the electronic device, the plurality of LEDs to emit the light signal corresponding to the first current, when the electronic device determines that the sixth current is greater than or equal to a first preset current; characterised in that the method further comprises: displaying, by the electronic device, first prompt information when the electronic device determines that the sixth current is not greater than or equal to the first preset current, wherein the first prompt information is used to indicate that wearing of the electronic device has not been detected. receiving, by the electronic device, a second operation, wherein the second operation is used to indicate start of monitoring of human body characteristics; in response to the second operation, using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a fifth current; and using, by the electronic device, at least one of the plurality of PDs to obtain a sixth current returned by the light signal corresponding to the fifth current via the human tissue; and the using, by the electronic device, the plurality of LEDs to emit a light signal corresponding to a first current comprises: using, by the electronic device, the plurality of LEDs to emit the light signal corresponding to the first current, when the electronic device determines that the sixth current is greater than or equal to a first preset current; characterised in that the method further comprises: displaying, by the electronic device, first prompt information when the electronic device determines that the sixth current is not greater than or equal to the first preset current, wherein the first prompt information is used to indicate that wearing of the electronic device has not been detected.