This paper presents a systemic analysis for the steady-state performance of novel cascade boost converters based on a developed switching signal flow graph (SFG) method. The effects caused by parasitic parameters are considered. The general guidelines for drawing switching SFG and the derivation of steady-state information are provided. With the applications to the examples, the proposed graphical analytical method shows the advantages of high convenience and practicability to the cascade boost converters. Both the circuit simulation and experimental results are provided to support the theoretical analysis.