Problems about intensity of Hall field are analyzed in AC, low-voltage DC and high-voltage DC(HVDC) transmission from microscopic view. It is because the intensity of Hall field is strong too much which is generated in AC and low-voltage DC transmission, the energy state of carrier increases in lattice potential field, work function of carrier decreases, the probability of carrier escape from surface of conductor rises. And it manifests magnetic resistance increasing. Because the high-voltage AC reduces the drift motion velocity, weakens the Hall field much, the energy state of carrier in lattice potential field has small variation, work function of carrier decrease little and the probability of carrier escape from surface of conductor is not high. And it manifests magnetic resistance decreasing. Thus, high-voltage DC transmission has the smallest energy consumption on circuit.% 从微观角度分析了交流输电、低压直流输电和高压直流输电过程中霍尔电场强弱的问题，认为交流输电和低压直流输电由于产生的霍尔电场过强，使得载流子在晶格势场中的能态升高，减小了载流子功函数，提高了载流子从导体表面逸出的概率，表现为磁阻增大；而采取高压交流输电，由于降低了载流子漂移运动速度，大大削弱了霍尔电场，使得载流子在晶格势场中的能态变化不大，载流子功函数减小不多，载流子从导体表面逸出的概率不高，减小了磁阻。因此，高压直流输电是电路上能量损耗最小的输电方式。
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