The VHF radiation and optical channel in a negative lightning have been comparatively analyzed by the synchronous data from 3D location system of lightning VHF radiation pulses and high-speed Camera system. The synchronous brightness data of channel complements current characteristics of VHF radiation source channel outside the cloud. The results show that the intensity of breakdown is great in the preliminary breakdown process, but the current in the channel is low, and the carrier is mainly avalanche of the charge. The current in the channel increase rapidly in return strike, and the carrier in addition to avalanche charge, there are a lot of cloud charge region from the charge. Throughout the process, the main channel has a higher brightness (outside the cloud), that is, there is a strong current movement in the main channel, and branching channel current is weak. The development and connection of its channels were analyzed carefully, and the formation process of two striking point in a negative flash was discussed in detail. There are upper radiation sources near the ground which may be result from upward leader from the tip.
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