Beijing Lightning NETwork (BLNET) is a regional full-flash three-dimensional（3D） location network combining research and business. In 2015, the BLNET hardware, station network layout and location algorithm were updated and upgraded to improve the sensitivity of the sensor and improve the computational efficiency and detection performance. BLNET not only has the functions of intra-cloud（IC） flash, cloud to ground（CG） flash pulse type identification and current peak estimation, but also realizes the 3D real-time location of lightning radiation pulse and the fine location of the channel-resolvable lightning discharge process. The analysis of the real-time 3D location results of the lightning radiation source pulse during a thunderstorm on July 7, 2017 shows that a total of 11,902 lightning flashes were observed during the thunderstorm process. Most of which were dominated by IC flash, and the CG flash accounted for 28% of the total flash. The positive cloud to ground （PCG）flash only accounts for 5% of the total CG flash. During the mature period of the thunderstorm, the maximum lightning frequency is 927 times/6 minutes. By comparing and analyzing the location of the lightning source and the radar echo at the corresponding time, it is found that the radiation source is basically concentrated in the strong echo range. The fine location of a PCG flash indicates that the initial stage shows a clear pre-breakdown process. The origin of the lightning source is about 5.4 km above sea level, and then the channel develops upwards. At about 10 km, the channel begins to follow. Level development. The fine location of a negative cloud to ground（NCG） flash indicates that the discharge first originates from a height of about 7.1 km, the channel develops to the south, and some negative pilot branches develop downward. After about 38 ms, the channel stops developing for a short time. After 17 ms, the channel begins. The hair is re-energized. The above results show that BLNET can not only locate and monitor the 3D real-time lightning activity of the whole thunderstorm life history, but also realize the fine location of the lightning three-dimensional discharge channel.