Aggregate stability is an important physical property of soils. As is known, organic macromolecules enhance stability of aggregates, while soil electric field acts reversely. Therefore, effect of coupling of electric field and organic macromolecules on soil aggregate stability, yet still unknown, is worthy of exploring. KNO₃ and Ca(NO₃)₂ solutions, different in concentration were used to adjust strength of soil electric field and humus and PAM added to control molecular attraction forces between soil particles in this experiment. Aggregate stability is characterized by content of the particles (<10 μm, <5 μm and <2 μm in particle size) released from aggregates after their breakdown. Results show that soil electric field plays a crucial role in breaking aggregates. When the electric field is strong enough, soil aggregates are likely to break up violently, no matter whether there exist organic macromolecules or not. Soil aggregates are ready to break down when they get wet. Addition of organic macromolecules significantly reduces the degree of aggregate breakdown by as much as 60% under the same electric field. Because of varying extent of the coupling between electric field and humus/PAM, clear discrepancies exist in extent of the breakdown. Strong electric field may lead to violent breakdown or explosion of aggregates. With increasing addition rate of organic macromolecules, the threshold potential triggering the explosion of aggregates declined correspondingly.