Researchers from many countries around the world have been conducting direct observation of lightning currents from high towers. However, when the lightning strikes the tall tower, due to the impedance mismatch of the lightning channel, the tower, and its grounding impedance, the lightning current will be refracted and reflected many times in the tower, resulting in unreal current measurements. Based on the transmission line model, this paper analyzes the current distribution characteristics of currents along the tall tower. Current in the tall tower is found to feature (the bottom of the tower is the exception) a secondary peak (typically the largest peak) after the first peak. As the tower height increases, the peak current in the tower decreases. The effects of the top and bottom reflection coefficients of the tower and its height on the current waveforms along the tower are further studied, and the first peak of the current waveform is found to increase with increasing absolute value of the top reflection coefficient. Moreover, the secondary current peak and the amplitude of the pulse also increase with an increasing absolute value of the reflection coefficient. Furthermore, an increase in the tower height will result in longer interval periods of the current pulse and a smaller secondary peak.