In order to analyze the liquid fueled molten salt reactor using RELAP5 code, models in RELAP5 code need to be extended. This paper attempts to add new point kinetic model of liquid fueled reactor and thermo-hydraulics model with internal heat source based on the original RELAP5 models, then the code is verified using MSRE experimental datum. The results indicate that the extended RELAP5 code can be applied to model and analyze the liquid fueled molten salt reactor.