Large aircraft fuel mass property has an important impact on the aircraft design and flight safety.Concerning the fact that the existing calculation methods of large aircrafts fuel mass property can not accurately simulate the actual fuel consumption process,which leads to great difference between the results and the reality.An oil-channeling model has been built to describe the fuel consumption laws based on the research of the aircraft fuel system fuel flow rule,and the new fuel mass property calculation method has been given in according to the model.The theoretical analysis and simulative calculation indicate that the oil-channeling model can simulate the oil flow more vividly in the cavities of the oil tank during the oil consumption process,and more accurate calculation results of the fuel mass property have been generated by applying this model,so that the engineering requirements can be better met.