Abstract: Through comparing the principle features of MnZn ferrite material of high permeability and amorphous alloy of FeCuNbSiB,this paper produced an improved solution to sensor performance by applying highly magnetic non-brilliant alloy of iron base to the testing windings of eddy current sensors.The two-dimensional decomposition testing circuit was designed to pick up signal of sensor.Then sensibility and linearity were compared between new sensors and traditional ferrite winding sensors.The experiment results showed that the new eddy current sensors have much better sensibility and linearity compared with their traditional peers.