With the increase of the complexity of aircraft systems, signal frequency and dense wiring make the electromagnetic energy coupling between cables more serious, and the crosstalk noise deteriorates continuously. In this paper, the capacitive coupling model and the inductive coupling model of crosstalk between cables are sorted out. LVDT sensor is used as rudder position sensor in large aircraft flight control system. Due to the increase of cable length, the measurement error caused by cable crosstalk coupling can not be ignored. The crosstalk coupling of the long cable will cause the LVDT sensor to increase the voltage measurement value, which will cause the rudder feedback to be out of control, and even harm the safety of the aircraft. The signal transmission on the long cable of LVDT sensor is simulated by CST software. The phase difference between the near end and the far end of the crosstalk current is 180° and the amplitude is equal. The near and far crosstalk voltages have the same phase and equal amplitude. Based on the analysis of capacitive coupling model and inductive coupling model, it can be seen that the interline capacitance between long cables is the main reason for the increase of voltage measurement value of LVDT sensor.