We test and analyse the three kinds of forms of erecting after the high pressure transmits electricity impracticably the line corridor mode changes in urban and rural areas intersection .Result indicate 220 kV/110 kV four return circuit pole tower forms exert a great influence on internal and external environment of room of peripheral building, when in the two beyond 60m apart, building room internal and external power-frequency electric magnetic field environment have heavy improvement; the building struct...