Nowadays, the issue of electromagnetic reliability due to the non-linear effect of the components in electronic products becomes more serious. In this paper, a simple and effective test and evaluation method based on narrow-band filter and microstrip line is designed to accurately demonstrate the characteristic of different Electrically Conductive Adhesives(ECA) under Sinusoidal Excitation. A filter is adopted to eliminate the intrinsic harmonics in the test system. The high-order harmonics components are generated due to the non-linear effect. The power of the third-order harmonics is used as a measurement index for non-linear effect of electrically conductive adhesives in this method. The comparison test can be conducted by measuring the power of the third-order harmonics of different electrically conductive adhesives. This work provides strong technology supports for the evaluation and design of Electrically Conductive Adhesives.