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Eddy current sensor is used to measure the gap between the rotating shaft and the water conducting rubber bearing of water pump on line to monitor the wear condition of bearing. Firstly, a double-layer planar eddy current inductor with diameter of 14 mm is designed by using electromagnetic calculation tools. Then, the impedance characteristics of the inductors made on the printed circuit board are measured under the conditions of air and water respectively. Then the corresponding inductance detection circuit is made to obtain an eddy current sensor integrating the probe and the detection circuit. The sensor adopts RS485 interface output, which is not affected by the length of communication cable. The size of the sensor after sealing and waterproof treatment is 76×25×12mm. The sensor has passed the laboratory test and water pump working condition test. Both Static and dynamic tests were carried out in the laboratory to obtain the characteristics of the sensor for gap measurement in water. The sensor achieves measurement accuracy of 0.02mm. At last a test on an axial flow pump was carried out. The test results show that the designed eddy current sensor can measure the rubber bearing gap of the pump online.