This paper presents an improved two-switch bridgeless PFC SEPIC (TSBPFC SEPIC) structure for reducing current total harmonic distortion (THD) and minimize circulating current. A conventional PFC SEPIC structure which has an integration between SEPIC and full-bridge rectifier possess some problems high current THDi output voltage ripple and a low PF. The existing bridgeless PFC SEPIC structure has two input inductors (L1 and L2) that causes circulating current and thus producing high current THDi at input source. In order to improve the existing structure of bridgeless PFC SEPIC, the proposed converter an additional capacitor is connected in parallel of input diode. In addition, comparisons between two converter which are existing bridgeless PFC SEPIC and Improved TSBPFC SEPIC structure are discussed. The prototype with specification of 100 W and 48 V dc output voltage is developed. The results show THDi of 0.99% and power factor of 0.98 are achieved with 50 kHz switching frequency.