Abstract: This paper describes the basic methods for testing the resistance 3-D braided composite materials. The SQUID technology based test method for electromagnetic parameters of 3-D braided composite material was studied in accordance with material properties. The change rules of resistance and electromagnetic property of the 3-D braided composite material under different loading conditions were examined. The experimental results show that the electrical characteristics of 3-D braided composite materials are affected by manufacturing parameters and way of loading. Resistance decreases with increasing of the thickness and fiber content and decreasing of surface braiding angle. The resistance shows linear increase within small tensile. When the tensile is more than 6%, the resistance shows non-linear increase. Three-point bending has great effect on resistance, the resistance and electromagnetic filed of the material under loading is bigger than that of unloading.