Abstract: Based on the modeling technology of modularization and topology generation,a linear small perturbation dynamics transfer matrix model was developed for analysis of a LOX(liquid oxygen)/kerosene staged combustion cycle engine.In the process of modeling,the gas-path model of the adiabatic flow assumption was adopted,and the entropy wave affections were emphatically studied.As per the alternating current fluid network theory,the low frequency characteristics of the engine system were investigated by using transfer function method;the research of this paper can benefit the POGO and engine dynamics studies of liquid rockets.