Based on the lightning data of 423 thunderstorms in the 7 years of BLNET(Beijing Lightning Network)and Surveillance et Alerte Foudre par Interometric Radioelectirque (SAFIR)-3000, and according to how many lightning flash is generated by thunderstorms, it is divided into weak thunderstorms (≤1,000 times) and strong thunderstorms (>1,000 times and ≤ 10,000 times) and super thunderstorms (>10,000 times), analyzed the spatial and temporal distribution characteristics of lightning flash in Beijing and the contribution of total thunderstorms with different intensity levels to lightning flash distribution. The average annual lightning flash density in Beijing is about 15.4 flash.km-2.year-1, and the average is about 1.9 flash.km-2.year-1.The lightning flash density high value area greater than 8 flash.km-2.year-1 is basically distributed in the plain area below the elevation of 200 meters above sea level. Different intensity thunderstorms contribute differently to the total thunderstorm lightning flash. The number of weak thunderstorms (super thunderstorms) is more (less), while the thunderstorms produce less lightning flash (more). The lightning flash generated by super thunderstorms and strong thunderstorms accounted for 37% and 56% of the total thunderstorm lightning flash, respectively. Different intensity thunderstorms have a significant impact on the distribution and daily variation characteristics of the total lightning flash intensity density of the total thunderstorm. The eastern part of Changping District, the central and eastern parts of Shunyi District and the main urban area of ??Beijing are the three thunderstorm lightning flash densities with a density greater than 12 flash.km-2.year-1. The first two high-value centers are greatly affected by strong thunderstorms, while the high-value centers in the main urban areas are mainly affected by super thunderstorms. The frequent lightning activities of thunderstorms in the evening are mainly affected by super thunderstorms and strong thunderstorms. These two types of thunderstorms were active at night, accounting for 69% and 65% of the total lightning flash, respectively, while the weak thunderstorm lightning activity increased rapidly during the day and greatly affected the lightning activity in the afternoon of the total thunderstorm. In addition, the difference in lightning conditions varies with different underlying conditions. The strongest lightning activity in the mountainous area occurs during the daytime. The lightning activity in the afternoon increases rapidly. The main peak appears at 18:00 in Beijing time, and the strongest lightning activity in the plain occurs at night. The main peak of the plain (Hawthorn) was delayed by about 1.5 hours (1 hour) than the mountainous area.