Abstract: In order to reduce the number of CD units in the two-phase interleaved parallel high-gain Boost converter based on the capacitance-diode（CD）booster units and improve the voltage gain of the converter,a new type of two-phase CD unit capacitors in parallel charging and series power supply is proposed. The interleaved Boost converter topology further exerts the boosting capability of the CD units. The topology evolution process of the new 3CD and 4CD two-phase interleaved parallel Boost converter is analyzed,and the topology evolution law of the new NCD two-phase interleaved parallel Boost converters is proposed. Taking the new 4CD two-phase interleaved parallel Boost converter as an example,the working principle of the converter and the influence of the parasitic resistance of the inductance and capacitance on the voltage gain of the converter are analyzed. Finally,a new 1 kW 4CD units interleaved parallel Boost converter is built on the StarSim hardware-in-the-loop experimental platform,which verifies the correctness of the topology proposed in this paper.