The invention provides a control method for sets of series-parallel-connected LEDs via a single wire. Step 1: providing an LED circuit including a control module and a light-emitting module. The light-emitting module includes LED strings connected to one another in parallel. Each of the LED strings includes a plurality of LED units connected in series to one another, and at least one counter comprising a counter start time different from that of another. Step 2: sending a setting signal by the control module, and allocating one identification code obtained sequentially in time to one of the LED string according to the different counter start times of the LED strings. Step 3: sending a designation signal to the light-emitting module by the control module, such that the LED string with the corresponding identification value is selected and independently controlled by the control module.