Abstract: The Reactor Monte Carlo code RMC,developed by REAL group,at Tsinghua University,has a function of kinetic calculation.RMC has participated in C5G7-TD transient benchmark calculation to further optimize its kinetic algorithm,and also to validate its results.The C5G7-TD benchmark consists of 6 sets of cases,28 subcases in total,where the movement or moderator density variation of the control rods is adopted in these cases to introduce the reactivity change.To decrease the oscillation in Monte Carlo calculation,1 million particles was used in the calculation,and non-uniform time steps were applied to reduce the calculation cost.Except for those cases with different specifications,the power profiles calculated by RMC are in good agreement with those of n TRACER.