Abstract: The passive residual heat remove system on the rolling roof was investigated experimentally and simulated. Under the condition of small rolling amplitude, the influence of rolling motion is limited, while the heat removed under the condition of big rolling amplitude decreases. The electrical power, which is influenced by the heat transfer coefficient, friction resistance and velocity, is not only the function of rolling amplitude and period. On the basis of RELAP5/MOD3.2, the drift flux model was used to replace the two-fluid model. The simulating and analysis program of passive residual heat remove system of rolling motion was established by modifying the mixture momentum equation, gravitational pressure drop and condensation heat transfer correlation. The module to compute the inverse of matrix was also added in the program. The simulation results are consistent with experiments.