It is found that the data precision of atmosphere data sensor is affected during the test-fly of a certain plane.The reason for this is that(sensor's) output signal on the transmission cable brings on a self-excitation caused by distributed capacitance.By contrast experiment,a solution is proposed that the self-excitation interference can be eliminated by connecting a eliminate circuit at both direct current high and low carry-out terminal of shelve-off equipment in this paper.The method can improve the anti-jamming ability of finished product.Finally,its validity is verified by experiments.