A control system for a bridgeless Power Factor Correction, PFC, circuit, connectable to the bridgeless PFC circuit, comprising an induction current sampling device, wherein the induction current sampling device comprises a first sampling unit, a second sampling circuit and a third sampling circuit, wherein the first sampling unit, connectable in serial with a first switch transistor of the bridgeless PFC circuit, is configured to sample a current flowing through the first switch transistor to acquire a first sampling signal; the second sampling unit, connectable in serial with a second switch transistor of the bridgeless PFC circuit, is configured to sample a current flowing through the second switch transistor to acquire a second sampling signal and the third sampling unit, with one terminal connectable with a ground of the bridgeless PFC circuit and the other terminal connectable with a negative output of a PFC capacitor of the bridgeless PFC circuit, is configured to sample a current flowing through a boost diode of the bridgeless PFC circuit to acquire a third sampling signal, the first sampling unit is a first sampling resistor or a first current sensing device, the second sampling unit is a second sampling resistor or a second current sensing device, and the third sampling unit is a third sampling resistor or a third current sensing device, when the first sampling unit is the first current sensing device, the second sampling unit is the second current sensing device, and the third sampling unit is the third current sensing device; the first current sensing device comprises a first current transformer, a fifth resistor, a fifth diode and a fourth sampling resistor, a first terminal on a secondary side of the first current transformer being connected with a first terminal of the fifth resistor, an anode of the fifth diode being connected with the first terminal of the fifth resistor, a cathode of the fifth diode, being connected with a first terminal of the fourth sampling resistor, a second terminal of the fifth resistor being connected with a second terminal of the fourth sampling resistor; the second current sensing device comprises a second current transformer, a sixth resistor, a sixth diode and a fifth sampling resistor, a first terminal on a secondary side of the second current transformer being connected with a first terminal of the sixth resistor, an anode of the sixth diode being connected with the first terminal of the sixth resistor, a cathode of the sixth diode being connected with a first terminal of the fifth sampling resistor, a second terminal of the sixth resistor being connected with a second terminal of the fifth sampling resistor; the third current sensing device comprises a third current transformer, a seventh resistor, a seventh diode and a sixth sampling resistor, a first terminal on a secondary side of the third current transformer being connected with a first terminal of the seventh resistor, an anode of the seventh diode being connected with the first terminal of the seventh resistor, a cathode of the seventh diode being connected with a first terminal of the sixth sampling resistor; a second terminal of the seventh resistor being connected with a second terminal of the sixth sampling resistor, wherein the first sampling signal the second sampling signal and the third sampling signal acquired by the first, second and third sampling units respectively are used to be selected as an induction current sampling signal of the bridgeless PFC circuit, characterized in that, the control system comprises a voltage sampling device, and the control system of the bridgeless PFC circuit is configured to: after receiving the first sampling signal, the second sampling signal and the third sampling signal transmitted from the induction current sampling device for a bridgeless PFC circuit and receiving AC input voltage sampling signals UL and UN transmitted from the voltage sampling device, calculate Uac according to formula 1: Uac = UL − UN if Uac>0 and Uac ≤ Uacref, select the first sampling signal as the induction current sampling signal of the bridgeless PFC circuit, wherein 0<Uacref<Upeak with Uacref being a reference level and Upeak being a peak value of an AC input voltage; if Uac>0 and Uac>Uacref, select the third sampling signal as the induction current sampling signal of the bridgeless PFC circuit; if Uac≤0 and Uac≥-Uacref, select the second sampling signal as the induction current sampling signal of the bridgeless PFC circuit; or if Uac>0 and Uac<-Uacref, select the third sampling signal as the induction current sampling signal of the bridgeless PFC circuit. after receiving the first sampling signal, the second sampling signal and the third sampling signal transmitted from the induction current sampling device for a bridgeless PFC circuit and receiving AC input voltage sampling signals UL and UN transmitted from the voltage sampling device, calculate Uac according to formula 1: Uac = UL − UN if Uac>0 and Uac ≤ Uacref, select the first sampling signal as the induction current sampling signal of the bridgeless PFC circuit, wherein 0<Uacref<Upeak with Uacref being a reference level and Upeak being a peak value of an AC input voltage; if Uac>0 and Uac>Uacref, select the third sampling signal as the induction current sampling signal of the bridgeless PFC circuit; if Uac≤0 and Uac≥-Uacref, select the second sampling signal as the induction current sampling signal of the bridgeless PFC circuit; or if Uac>0 and Uac<-Uacref, select the third sampling signal as the induction current sampling signal of the bridgeless PFC circuit.