This paper established the mathematical models of the whole operation process of gelled propellant rocket engine based on system disassembly.In order to obtain higher precision in simulation calculation,we made use of the propellant flowing experiment results to adjust the parameter values of some important characteristics.The established ordinary differential equation set can synchronously take the inertia,viscosity and compressibility of liquid into account,so it can generally reflect the distributed characteristics of the operation process in the supplying system. Based on the simulation data,the dynamic characteristics of the engine were discussed.The results can provide some refernces for designing the gelled propellant rocket engine in the future.