Abstract: Based on the lattice code Dragon and nodal code Donjon for reactor core, the liquid molten salt experimental reactor (LMSER), which contains the top and bottom molten salt chambers, control rod, experimental hole and neutron source channel, was analyzed in this study. Equivalent homogenization models of different assemblies of LMSER were given. The neutron energy group of LMSER was divided into 5 kinds of broad energy group structures according to the characteristics of LMSER. For each kind of broad energy group structure, the effective multiplication factor and control rod worth with single control rod and different control rod groups inserted into the core were investigated. The results show that more precise calculation results are obtained by taking the 7-group structure. Thereafter, the radial and axial core power distributions, and the temperature reactivity coefficient without control rod insertion were calculated based on the 7-group structure. The calculation result agrees well with that calculated by MCNP5, which therefore proves the reasonability of equivalent homogenization model and the feasibility of Dragon and Donjon codes for LMSER calculation.