Wenchang, Hainan Province, learned from the National Space Administration on December 22 that at 12:37 on December 22, the first flight test of China’s independently developed new medium-sized carrier rocket, Long March 8, was successfully carried out at the Wenchang space launch site of China. The rocket flew normally and the test was a complete success. < / P > < p > the Long March 8 launch vehicle fully inherits the technical achievements of Long March 5 and Long March 7 launch vehicles, adopts non-toxic and pollution-free propellant, with a core stage diameter of 3.35 meters, a core stage diameter of 3 meters, a fairing diameter of 4.2 meters, and is bundled with two boosters with a diameter of 2.25 meters, with a total length of about 50.3 meters, a take-off mass of about 356 tons, and a 700 km solar synchronous orbit carrying capacity of not less than 4.5 tons The gap of 3-4.5-ton carrying capacity of China’s sun synchronous orbit is analyzed, which is of great significance for accelerating the upgrading of launch vehicles. It will form a new generation of launch vehicles with large, medium and small carrying capacity and reasonable layout with Long March 5, Long March 6, Long March 7 and other non-toxic and pollution-free launch vehicles. < p > < p > five experimental satellites carried on the first flight of the Long March 8 carrier rocket have accurately entered the predetermined orbit. The relevant satellite payload will carry out on orbit verification of microwave imaging and other technologies, and carry out experiments and applications of space science, remote sensing and communication technologies. < p > < p > the Long March 8 launch vehicle project was approved by the National Space Administration and implemented in 2017. The China Academy of launch vehicle technology of China Aerospace Science and Technology Group Co., Ltd. is responsible for the overall development of the launch vehicle system, and the China satellite launch measurement and control system department is responsible for the organization and implementation of the flight test. The mission is the 356th launch of the long march series of launch vehicles.