During all stages of the flight, the water in fuel and the moisture in the atmosphere will enter the fuel system. As the external temperature decreases, the pipe wall of the fuel system will freeze, which will affect the pressure and quantity of oil supply. The icing in the fuel system pipeline will affect the safety of the aircraft engine, thereby threatening the flight safety. Therefore, it is important to study the icing characteristics of fuel system pipeline for optimizing fuel system design. In order to analyze the icing characteristics of the fuel system pipeline for civil aircraft, based on the test data, the pressure drop calculation model and the icing quantity calculation model were established by using dimensional analysis. By comparing the results of calculation and experiment, within the selected test range, the results show that the calculated results of the pressure drop model of pipeline icing test are consistent with the changing trend of the test, and the average relative error is 10.35%; the smaller the pipeline diameter, the greater the pressure drop loss caused by pipeline icing; the lower the temperature, the greater the pressure drop caused by pipeline icing; when the temperature is lower than -11 ℃, the increasing rate of pressure drop decreases.