This paper takes the 500 kV Dehong compact-type transmission line as the example to analyze the possible conductor type,conductor splitting spacing and conductor arrangement.The internationally accepted and verified computation methods are adopted to study the maximum electric potential gradient of conductor surface and radio interference under different conditions of conductor arrangement,conductor type and the conductor splitting spacing in high altitude localities.According to the calculation results,the conductor arrangement,conductor type and conductor splitting spacing are determined which are suit for radio interference level.