通过对典型线路跨越建筑物时工频电场强度的计算与分析，研究了DL/T 5092—1999《110~500 kV架空输电线路设计技术规程》中跨越建筑物高度限值下的电场状况，对部分塔型跨越高度和工频电场进行了优化计算，可为新建线路设计和施工提供参考。

By the calculation and analysis of intensity of power frequency electrical field for typical transmission line over buildings, the electric field with height limit is investigated based on the technical code for designing 110~500 kV overhead transmission line. Furthermore, the height of the tower and intensity of the power frequency electric field are optimizedly calculated, providing references for the design and construction of new power transmission lines.