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To solve the deterioration problem of the reflectance, differential reflectance and other parameters when the X-band phased array weather radar is interfered with by metallic lightning rods and metallic down-conductor systems, the segmented metal foil array is used as the guiding structure of the down-conductor system, and a new type of wave-transmitting lightning rod is designed in combination with a high-performance composite rod, successfully solving the problem of wave transmittance and lightning current: a continuous plasma channel is formed by the lightning electric field, which can be used as a lightning flow path; the radar reflectivity is greatly reduced by the discontinuous special metal foil. In order to verify the protection and transmission capability of the wave-transparent lightning rod, tests are carried out: (1) the test of the high voltage attachment point and impulse discharge capacity, the average breakdown threshold of the wave-transparent lightning rod is 4.45 kV/cm, and the impulse discharge capacity is greater than 150 kA (±10%, 10/350 μs), which meets the requirements of the second level lightning protection stipulated in the GB50057 standard; (2) the field installation test, the test results show that the influence of the new type of beam on radar reflectance and differential reflectance is greatly reduced. The new wave-transparent lightning rod can greatly reduce the negative influences of the lightning protection system on radar detection performance and can be further applied and popularised in direct lightning protection of similar phased array radar.