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Thermal to fusion neutron convertor has now being studied in China Academy of Engineering Physics (CAEP). Current Monte Carlo codes, such as MCNP and GEANT, are inadequate when applied in this multi-step reactions problems. A Monte Carlo tool RSMC (Reaction sequence Monte Carlo) has been developed to simulate such coupled problem, from ion generated by neutron, to charged particle ionization and secondary neutron produced by triton. To validate our code, accelerator driven mono-energy 14 MeV fusion neutron source has been employed, which is so mature that is suitable as a benchmark. Various parameters have been calculated by our code with implicit capture sampling method for low yield secondary particle, including fusion neutron angle distribution, average neutron energy at different emission directions, differential and integral energy distributions. These parameters have also been calculated with deterministic method as references. Good agreement of our code with traditional method has been achieved for the charged particle induced secondary neutrons. 6 LiD convertor has at last been studied by our code. Conversion ratio of 1mm pure 6 LiD with a typical thermal neutron (Maxwell spectrum) incidence is about 2.31×10 -4 . And the ideal conversion ratio is related to