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研究了震前自然电场的前兆及其可能机理。主要结论：（１）５．４－６．２级地震在１５０－２００ｋｍ， ７． ０－ ７． ９级地震在 ２５０ ｋｍ范围内自然电场出现前兆；（２）过滤电场、电化学电场、土体受压变密和机电转换可能是自然电场的前兆机理。
The precursor of natural electric field before earthquake and its possible mechanism are studied. Main conclusions: (1) Earthquakes of magnitude 5.4-6.2 are at 150-200km, 7. 0-7. Earthquake of magnitude 9 occurred a precursor of natural electric field within a range of 250 km. (2) Filtration electric field, electrochemical electric field, compressive compaction of soil mass and electromechanical transformation may be precursors of natural electric field.